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<!DOCTYPE html>
<html lang="bn" data-theme="dark">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Oracle SQL — বাংলা লেকচার</title>
<link href="https://fonts.googleapis.com/css2?family=Hind+Siliguri:wght@300;400;500;600;700&family=JetBrains+Mono:ital,wght@0,300;0,400;0,600;0,700;1,400&display=swap" rel="stylesheet">
<style>
/* ═══════════════════════════════════════
DESIGN TOKENS
═══════════════════════════════════════ */
:root[data-theme="dark"] {
--bg: #070b14;
--bg2: #0c1120;
--bg3: #111828;
--card: #0f1624;
--card2: #141e30;
--border: #1e2d4a;
--border2: #263550;
--accent: #00c8ff;
--accent2: #0090e0;
--accent3: #00e5b8;
--gold: #ffcc44;
--pink: #ff6eb4;
--text: #e2eaf8;
--text2: #8ca0c0;
--text3: #3a5070;
--kw: #ff6eb4;
--str: #00e5b8;
--num: #ffcc44;
--cm: #3a5070;
--fn: #00c8ff;
--op: #ff9f43;
--code-bg: #050911;
--code-border: #1a2840;
--result-bg: #080d18;
--table-hd: #0d1a30;
--table-alt: #0a1020;
--prog-bg: #0c1120;
--shadow: 0 40px 100px rgba(0,0,0,.8), 0 0 0 1px rgba(0,200,255,.04);
--glow-card: 0 0 60px rgba(0,200,255,.06);
--particle: rgba(0,200,255,.25);
}
:root[data-theme="light"] {
--bg: #eef2fa;
--bg2: #e4eaf6;
--bg3: #d8e0f0;
--card: #ffffff;
--card2: #f5f8ff;
--border: #c4cfe8;
--border2: #b0bedd;
--accent: #005fc8;
--accent2: #0048a0;
--accent3: #007a5a;
--gold: #9a6800;
--pink: #b0006a;
--text: #0e1a30;
--text2: #3a5070;
--text3: #8090b0;
--kw: #b0006a;
--str: #007a5a;
--num: #9a6800;
--cm: #8090b0;
--fn: #005fc8;
--op: #b05000;
--code-bg: #f0f4ff;
--code-border: #c4cfe8;
--result-bg: #f5f8ff;
--table-hd: #dde6f8;
--table-alt: #eef2fc;
--prog-bg: #d8e0f0;
--shadow: 0 20px 60px rgba(0,0,0,.12), 0 0 0 1px rgba(0,96,200,.06);
--glow-card: 0 0 40px rgba(0,96,200,.05);
--particle: rgba(0,96,200,.15);
}
/* ═══════════════════════════════════════
RESET & BASE
═══════════════════════════════════════ */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { font-size: 15px; }
body {
font-family: 'Hind Siliguri', sans-serif;
background: var(--bg);
color: var(--text);
min-height: 100vh;
display: flex;
flex-direction: column;
overflow: hidden;
transition: background .5s, color .5s;
position: relative;
}
/* ── floating particles bg ── */
.particles {
position: fixed; inset: 0;
pointer-events: none;
overflow: hidden;
z-index: 0;
}
.particle {
position: absolute;
border-radius: 50%;
background: var(--particle);
animation: float linear infinite;
opacity: 0;
}
@keyframes float {
0% { transform: translateY(100vh) scale(0); opacity: 0; }
10% { opacity: 1; }
90% { opacity: .6; }
100% { transform: translateY(-10vh) scale(1.2); opacity: 0; }
}
/* ═══════════════════════════════════════
TOP BAR
═══════════════════════════════════════ */
.topbar {
position: relative; z-index: 50;
display: flex; align-items: center; gap: 16px;
padding: 10px 24px;
background: var(--bg2);
border-bottom: 1px solid var(--border);
backdrop-filter: blur(20px);
flex-shrink: 0;
}
.logo {
display: flex; align-items: center; gap: 10px;
font-family: 'JetBrains Mono', monospace;
font-weight: 700; font-size: 13px;
color: var(--accent);
letter-spacing: .04em;
flex-shrink: 0;
}
.logo-box {
width: 30px; height: 30px;
background: linear-gradient(135deg, var(--accent2), var(--accent));
border-radius: 8px;
display: flex; align-items: center; justify-content: center;
font-size: 15px; font-weight: 900; color: #fff;
box-shadow: 0 0 16px rgba(0,200,255,.4);
animation: logoGlow 3s ease-in-out infinite;
}
@keyframes logoGlow {
0%,100% { box-shadow: 0 0 16px rgba(0,200,255,.4); }
50% { box-shadow: 0 0 28px rgba(0,200,255,.7); }
}
.topbar-title {
flex: 1;
text-align: center;
font-family: 'Hind Siliguri', sans-serif;
font-size: 13px; font-weight: 600;
color: var(--text2);
letter-spacing: .03em;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
.topbar-title .chapter {
color: var(--accent);
font-family: 'JetBrains Mono', monospace;
font-size: 11px;
letter-spacing: .1em;
margin-right: 8px;
background: rgba(0,200,255,.1);
padding: 2px 8px;
border-radius: 4px;
border: 1px solid rgba(0,200,255,.2);
}
.topbar-right { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.theme-btn {
display: flex; align-items: center; gap: 6px;
padding: 6px 14px;
background: var(--bg3);
border: 1px solid var(--border);
border-radius: 20px;
cursor: pointer;
font-family: 'Hind Siliguri', sans-serif;
font-size: 12px; color: var(--text2);
transition: all .25s;
white-space: nowrap;
}
.theme-btn:hover { border-color: var(--accent); color: var(--accent); background: rgba(0,200,255,.06); }
/* ═══════════════════════════════════════
PROGRESS BAR
═══════════════════════════════════════ */
.progress-track {
position: relative; z-index: 50;
background: var(--prog-bg);
height: 5px;
flex-shrink: 0;
}
.progress-fill {
height: 100%;
background: linear-gradient(90deg, var(--accent2), var(--accent), var(--accent3));
background-size: 200% 100%;
animation: shimmer 2s linear infinite;
transition: width .6s cubic-bezier(.4,0,.2,1);
border-radius: 0 3px 3px 0;
position: relative;
}
.progress-fill::after {
content: '';
position: absolute; right: 0; top: 50%;
transform: translateY(-50%);
width: 10px; height: 10px;
background: var(--accent);
border-radius: 50%;
box-shadow: 0 0 10px var(--accent);
}
@keyframes shimmer {
0% { background-position: 200% 0; }
100% { background-position: -200% 0; }
}
/* ═══════════════════════════════════════
STAGE
═══════════════════════════════════════ */
.stage {
flex: 1;
display: flex; align-items: center; justify-content: center;
padding: 20px 16px 12px;
overflow: hidden;
position: relative; z-index: 10;
}
.slide-viewport {
width: 100%; max-width: 980px;
position: relative;
}
/* ── SLIDE ── */
.slide {
display: none;
background: var(--card);
border: 1px solid var(--border);
border-radius: 22px;
padding: 40px 48px;
box-shadow: var(--shadow), var(--glow-card);
min-height: 450px;
position: relative;
overflow: hidden;
}
.slide.active { display: block; }
/* animated entry/exit */
.slide.anim-in-right { animation: inRight .5s cubic-bezier(.3,0,.1,1) forwards; }
.slide.anim-in-left { animation: inLeft .5s cubic-bezier(.3,0,.1,1) forwards; }
.slide.anim-out-left { animation: outLeft .38s cubic-bezier(.4,0,1,1) forwards; }
.slide.anim-out-right{ animation: outRight.38s cubic-bezier(.4,0,1,1) forwards; }
@keyframes inRight { from{opacity:0;transform:translateX(80px) scale(.96) rotateY(-3deg)} to{opacity:1;transform:none} }
@keyframes inLeft { from{opacity:0;transform:translateX(-80px) scale(.96) rotateY(3deg)} to{opacity:1;transform:none} }
@keyframes outLeft { from{opacity:1;transform:none} to{opacity:0;transform:translateX(-70px) scale(.96)} }
@keyframes outRight { from{opacity:1;transform:none} to{opacity:0;transform:translateX(70px) scale(.96)} }
/* left accent stripe */
.slide::before {
content:'';
position:absolute; left:0; top:32px; bottom:32px; width:4px;
background: linear-gradient(180deg, var(--accent2), var(--accent), var(--accent3));
border-radius: 0 4px 4px 0;
box-shadow: 2px 0 20px rgba(0,200,255,.25);
}
/* bg grid lines decoration */
.slide::after {
content:'';
position:absolute; inset:0;
background-image:
linear-gradient(rgba(0,200,255,.015) 1px, transparent 1px),
linear-gradient(90deg, rgba(0,200,255,.015) 1px, transparent 1px);
background-size: 40px 40px;
pointer-events:none;
border-radius: 22px;
}
/* corner glow */
.slide-glow {
position:absolute; right:-80px; top:-80px;
width:260px; height:260px;
background: radial-gradient(circle, rgba(0,200,255,.08) 0%, transparent 70%);
pointer-events:none;
animation: glowPulse 4s ease-in-out infinite;
}
@keyframes glowPulse {
0%,100%{ opacity:.6; transform:scale(1); }
50% { opacity:1; transform:scale(1.15); }
}
/* ── SLIDE HEADER ── */
.slide-tag {
display: flex; align-items: center; gap: 10px;
font-family: 'JetBrains Mono', monospace;
font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase;
color: var(--accent);
margin-bottom: 14px;
}
.slide-tag .tag-pill {
background: rgba(0,200,255,.1);
border: 1px solid rgba(0,200,255,.25);
border-radius: 12px;
padding: 3px 12px;
}
.slide-tag::after { content:''; flex:1; height:1px; background:linear-gradient(90deg,var(--border),transparent); }
h2.shead {
font-family: 'Hind Siliguri', sans-serif;
font-size: 27px; font-weight: 700;
line-height: 1.2; color: var(--text);
margin-bottom: 8px;
}
h2.shead .hl { color: var(--accent); }
h2.shead .hl2 { color: var(--accent3); }
h2.shead .hl3 { color: var(--gold); }
.ssub {
font-size: 14px; color: var(--text2); line-height: 1.75;
margin-bottom: 18px;
}
/* ═══════════════════════════════════════
CODE BLOCK
═══════════════════════════════════════ */
.cb {
background: var(--code-bg);
border: 1px solid var(--code-border);
border-radius: 14px;
overflow: hidden;
margin: 12px 0;
font-family: 'JetBrains Mono', monospace;
transition: border-color .2s;
position: relative;
}
.cb:hover { border-color: var(--accent2); }
.cb:hover .cb-header { border-bottom-color: var(--accent2); }
.cb-header {
display: flex; align-items: center; justify-content: space-between;
padding: 9px 15px;
background: var(--bg3);
border-bottom: 1px solid var(--code-border);
}
.cb-dots { display:flex; gap:5px; }
.cb-dots span { width:9px;height:9px;border-radius:50%; }
.cb-dots span:nth-child(1){background:#ff5f57;}
.cb-dots span:nth-child(2){background:#febc2e;}
.cb-dots span:nth-child(3){background:#28c840;}
.cb-lang {
font-size: 10.5px; color: var(--text3); letter-spacing:.1em;
padding: 2px 8px; background: rgba(0,200,255,.06);
border: 1px solid var(--code-border); border-radius: 5px;
}
.cb-copy {
background:none; border:1px solid var(--border);
border-radius:6px; padding:3px 10px;
font-size:10.5px; color:var(--text3); cursor:pointer;
font-family:'JetBrains Mono',monospace;
transition:all .2s;
}
.cb-copy:hover { border-color:var(--accent); color:var(--accent); }
.cb-body {
padding: 16px 20px;
overflow-x: auto;
line-height: 1.9;
font-size: 13px;
counter-reset: line;
}
.cb-body .ln {
display: inline-block;
width: 26px; text-align:right;
color: var(--text3); user-select:none;
margin-right: 14px;
font-size: 11px;
border-right: 1px solid var(--code-border);
padding-right: 8px;
}
.kw { color:var(--kw); font-weight:600; }
.str { color:var(--str); }
.num { color:var(--num); }
.cm { color:var(--cm); font-style:italic; }
.fn { color:var(--fn); }
.op { color:var(--op); }
.hl-line { background: rgba(0,200,255,.06); display:block; margin:0 -20px; padding:0 20px; }
/* ═══════════════════════════════════════
RESULT TABLE
═══════════════════════════════════════ */
.res-label {
font-family:'JetBrains Mono',monospace;
font-size:10.5px; letter-spacing:.1em; color:var(--accent3);
margin: 10px 0 6px;
display:flex; align-items:center; gap:6px;
}
.res-label::before { content:'▶'; color:var(--accent); font-size:9px; }
.res-wrap {
background:var(--result-bg); border:1px solid var(--code-border);
border-radius:10px; overflow:hidden; margin-bottom:12px;
overflow-x: auto;
}
table.rt {
width:100%; border-collapse:collapse;
font-family:'JetBrains Mono',monospace; font-size:11.5px;
}
table.rt th {
background:var(--table-hd); color:var(--gold);
padding:8px 14px; text-align:left; font-weight:600;
letter-spacing:.06em; border-bottom:1px solid var(--code-border);
white-space:nowrap;
}
table.rt td {
padding:7px 14px; color:var(--text2);
border-bottom:1px solid var(--code-border);
white-space:nowrap;
}
table.rt tr:last-child td{border-bottom:none;}
table.rt tr:nth-child(even) td{background:var(--table-alt);}
table.rt tr:hover td{background:rgba(0,200,255,.05);color:var(--text);transition:.15s;}
/* ═══════════════════════════════════════
LAYOUT HELPERS
═══════════════════════════════════════ */
.two-col { display:grid; grid-template-columns:1fr 1fr; gap:18px; align-items:start; }
.three-col{ display:grid; grid-template-columns:1fr 1fr 1fr; gap:12px; }
@media(max-width:680px){ .two-col,.three-col{ grid-template-columns:1fr; } }
/* ═══════════════════════════════════════
CARDS
═══════════════════════════════════════ */
.card-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(175px,1fr)); gap:12px; margin:12px 0; }
.ccard {
background:var(--card2); border:1px solid var(--border);
border-radius:12px; padding:16px;
transition:transform .25s,border-color .25s,box-shadow .25s;
position:relative; overflow:hidden;
animation: cardAppear .5s ease backwards;
}
.ccard:hover {
transform:translateY(-4px);
border-color:var(--accent);
box-shadow:0 8px 30px rgba(0,200,255,.12);
}
@keyframes cardAppear {
from{opacity:0;transform:translateY(16px);}
to{opacity:1;transform:none;}
}
.ccard:nth-child(1){animation-delay:.05s;}
.ccard:nth-child(2){animation-delay:.1s;}
.ccard:nth-child(3){animation-delay:.15s;}
.ccard:nth-child(4){animation-delay:.2s;}
.ccard:nth-child(5){animation-delay:.25s;}
.ccard:nth-child(6){animation-delay:.3s;}
.ccard .ci { font-size:26px; margin-bottom:8px; }
.ccard .ct { font-weight:700; font-size:13.5px; color:var(--text); margin-bottom:4px; }
.ccard .cb2{ font-size:12px; color:var(--text2); line-height:1.6; }
.ccard::before {
content:'';
position:absolute; top:0; left:0; right:0; height:2px;
background:linear-gradient(90deg,var(--accent2),var(--accent3));
opacity:0; transition:opacity .25s;
}
.ccard:hover::before{opacity:1;}
/* ═══════════════════════════════════════
INFO BOXES
═══════════════════════════════════════ */
.ibox {
border-radius:10px; padding:12px 16px;
margin:10px 0; font-size:13px; line-height:1.7;
border-left:4px solid; display:flex; gap:10px; align-items:flex-start;
animation: fadeUp .4s ease backwards;
}
@keyframes fadeUp {
from{opacity:0;transform:translateY(10px);}
to{opacity:1;transform:none;}
}
.ibox.tip { background:rgba(0,229,184,.06); border-color:var(--accent3); color:var(--accent3); }
.ibox.warn { background:rgba(255,204,68,.06); border-color:var(--gold); color:var(--gold); }
.ibox.info { background:rgba(0,200,255,.06); border-color:var(--accent); color:var(--accent); }
.ibox.err { background:rgba(255,110,180,.06);border-color:var(--pink); color:var(--pink); }
.ibox-icon { font-size:16px; flex-shrink:0; margin-top:1px; }
/* ═══════════════════════════════════════
SYNTAX DIAGRAM
═══════════════════════════════════════ */
.syntax {
background:var(--bg3); border:1px dashed var(--border2);
border-radius:10px; padding:14px 18px;
font-family:'JetBrains Mono',monospace; font-size:12.5px;
color:var(--text2); margin:10px 0; line-height:2.1;
}
.syntax .sr { color:#fff; background:var(--accent2); padding:2px 8px; border-radius:4px; font-size:12px; }
.syntax .so { color:var(--gold); border:1px solid var(--gold); padding:2px 8px; border-radius:4px; font-size:12px; }
.syntax .sm { color:var(--text3); font-style:italic; font-size:11px; }
/* ═══════════════════════════════════════
LIST
═══════════════════════════════════════ */
ul.slist { list-style:none; display:flex; flex-direction:column; gap:9px; }
ul.slist li {
display:flex; align-items:flex-start; gap:10px;
font-size:13.5px; color:var(--text2); line-height:1.65;
animation: fadeUp .4s ease backwards;
}
ul.slist li:nth-child(1){animation-delay:.05s;}
ul.slist li:nth-child(2){animation-delay:.1s;}
ul.slist li:nth-child(3){animation-delay:.15s;}
ul.slist li:nth-child(4){animation-delay:.2s;}
ul.slist li:nth-child(5){animation-delay:.25s;}
.slist .bul {
flex-shrink:0; width:22px; height:22px;
background:linear-gradient(135deg,var(--accent2),var(--accent));
border-radius:6px; display:flex; align-items:center; justify-content:center;
font-size:11px; font-weight:700; color:#fff; margin-top:1px;
}
ul.slist li strong{color:var(--text);}
/* ═══════════════════════════════════════
FUNCTION BADGE ROW
═══════════════════════════════════════ */
.fn-badges { display:flex; flex-wrap:wrap; gap:8px; margin:12px 0; }
.fn-badge {
background:var(--bg3); border:1px solid var(--border);
border-radius:8px; padding:7px 14px;
font-family:'JetBrains Mono',monospace; font-size:12px; color:var(--fn);
cursor:pointer; transition:all .2s;
animation: fadeUp .4s ease backwards;
}
.fn-badge:hover,.fn-badge.active {
background:rgba(0,200,255,.12); border-color:var(--accent); color:var(--accent);
box-shadow:0 0 14px rgba(0,200,255,.15);
}
/* ═══════════════════════════════════════
TITLE SLIDE
═══════════════════════════════════════ */
.title-hero { text-align:center; padding:10px 0; }
.hero-badge {
display:inline-flex; align-items:center; gap:8px;
background:rgba(0,200,255,.08); border:1px solid rgba(0,200,255,.2);
border-radius:20px; padding:5px 18px;
font-family:'JetBrains Mono',monospace; font-size:11px;
color:var(--accent); letter-spacing:.1em; margin-bottom:20px;
}
.live-dot {
width:7px;height:7px;border-radius:50%;
background:var(--accent3);
animation:blink 1.4s infinite;
}
@keyframes blink{0%,100%{opacity:1;}50%{opacity:.2;}}
.title-main {
font-family:'Hind Siliguri',sans-serif;
font-size:50px; font-weight:700; line-height:1.1;
background:linear-gradient(135deg,var(--text) 20%,var(--accent) 60%,var(--accent3));
-webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
margin-bottom:14px;
animation: titleReveal .8s ease forwards;
}
@keyframes titleReveal {
from{opacity:0;transform:translateY(20px);}
to{opacity:1;transform:none;}
}
.title-sub {
font-size:15px; color:var(--text2); line-height:1.75;
margin-bottom:28px; max-width:540px; margin-left:auto;margin-right:auto;
}
.topic-chips { display:flex; flex-wrap:wrap; gap:7px; justify-content:center; }
.chip {
background:var(--bg3); border:1px solid var(--border);
border-radius:20px; padding:5px 14px;
font-size:12px; color:var(--text2);
font-family:'JetBrains Mono',monospace;
transition:all .2s; cursor:default;
animation: chipPop .4s ease backwards;
}
.chip:hover { border-color:var(--accent); color:var(--accent); }
@keyframes chipPop {
from{opacity:0;transform:scale(.8);}
to{opacity:1;transform:scale(1);}
}
/* ═══════════════════════════════════════
JOIN DIAGRAM
═══════════════════════════════════════ */
.join-vis {
display:flex; align-items:center; justify-content:center;
gap:0; margin:14px 0 6px; position:relative; padding-bottom:28px;
}
.jc {
width:110px;height:110px;border-radius:50%;
display:flex;align-items:center;justify-content:center;
font-family:'JetBrains Mono',monospace; font-size:11.5px; font-weight:600;
flex-shrink:0; position:relative; text-align:center; line-height:1.3;
}
.jc-l { background:rgba(255,110,180,.15); border:2px solid var(--pink); color:var(--pink); z-index:2; }
.jc-r { background:rgba(0,200,255,.15); border:2px solid var(--accent); color:var(--accent); margin-left:-38px; z-index:1; }
.jc-label {
position:absolute; bottom:-22px; left:50%; transform:translateX(-50%);
font-size:9.5px; color:var(--text3); white-space:nowrap;
font-family:'JetBrains Mono',monospace;
}
.join-tabs { display:flex; gap:8px; flex-wrap:wrap; margin-top:8px; }
.jtab {
background:var(--bg3); border:1px solid var(--border);
border-radius:8px; padding:7px 14px;
font-family:'JetBrains Mono',monospace; font-size:11.5px; color:var(--text2);
cursor:pointer; transition:all .2s;
}
.jtab:hover,.jtab.active {
background:linear-gradient(135deg,var(--accent2),var(--accent));
color:#fff; border-color:transparent;
box-shadow:0 4px 14px rgba(0,200,255,.25);
}
/* ═══════════════════════════════════════
INTERACTIVE LAB
═══════════════════════════════════════ */
.lab-wrap {
background:var(--code-bg); border:1px solid var(--code-border);
border-radius:14px; overflow:hidden; margin:12px 0;
}
.lab-header {
display:flex;align-items:center;justify-content:space-between;
padding:10px 16px;
background:var(--bg3); border-bottom:1px solid var(--code-border);
}
.lab-title {
font-family:'JetBrains Mono',monospace;
font-size:11px; color:var(--accent); letter-spacing:.1em; font-weight:600;
display:flex;align-items:center;gap:8px;
}
.lab-title .pulse-ring {
width:10px;height:10px;border-radius:50%;background:var(--accent);
box-shadow:0 0 0 0 rgba(0,200,255,.4);
animation:pulse-ring 1.5s infinite;
}
@keyframes pulse-ring {
0% {box-shadow:0 0 0 0 rgba(0,200,255,.4);}
70% {box-shadow:0 0 0 8px rgba(0,200,255,0);}
100%{box-shadow:0 0 0 0 rgba(0,200,255,0);}
}
.run-btn {
background:linear-gradient(135deg,var(--accent2),var(--accent));
color:#fff; border:none; border-radius:8px;
padding:7px 18px;
font-family:'JetBrains Mono',monospace; font-size:12px; font-weight:600;
cursor:pointer; display:flex;align-items:center;gap:6px;
transition:all .2s; box-shadow:0 4px 14px rgba(0,200,255,.3);
}
.run-btn:hover { transform:translateY(-1px); box-shadow:0 6px 20px rgba(0,200,255,.4); }
.run-btn:active{ transform:translateY(1px); }
textarea.sqled {
width:100%; background:var(--code-bg); color:var(--text);
border:none; padding:16px 20px;
font-family:'JetBrains Mono',monospace; font-size:12.5px; line-height:1.85;
resize:vertical; min-height:120px; outline:none;
border-bottom:1px solid var(--code-border);
tab-size: 4;
}
.lab-output {
padding:14px 20px;
font-family:'JetBrains Mono',monospace; font-size:12px;
color:var(--text2); min-height:52px; background:var(--result-bg);
}
.ex-btns { display:flex; gap:7px; flex-wrap:wrap; margin-top:8px; }
.ex-btn {
background:var(--bg3); border:1px solid var(--border);
border-radius:8px; padding:6px 13px;
font-family:'JetBrains Mono',monospace; font-size:11.5px; color:var(--text2);
cursor:pointer; transition:all .2s;
}
.ex-btn:hover,.ex-btn.active {
background:rgba(0,229,184,.1);
border-color:var(--accent3); color:var(--accent3);
}
/* ═══════════════════════════════════════
FUNCTION TABLE (scalar / aggregate rows)
═══════════════════════════════════════ */
.fn-table-wrap {
background:var(--result-bg); border:1px solid var(--code-border);
border-radius:12px; overflow:hidden; margin:10px 0;
}
table.fntbl {
width:100%; border-collapse:collapse;
font-size:12.5px;
}
table.fntbl th {
background:var(--table-hd); color:var(--accent);
padding:8px 14px; text-align:left; font-weight:700;
letter-spacing:.05em; border-bottom:1px solid var(--code-border);
font-family:'JetBrains Mono',monospace;
}
table.fntbl td {
padding:8px 14px; border-bottom:1px solid var(--code-border);
vertical-align:top; line-height:1.6;
}
table.fntbl tr:last-child td{border-bottom:none;}
table.fntbl tr:nth-child(even) td{background:var(--table-alt);}
table.fntbl tr:hover td{background:rgba(0,200,255,.04);transition:.15s;}
table.fntbl .fn-name{
font-family:'JetBrains Mono',monospace;
color:var(--fn); font-weight:600;
}
table.fntbl .fn-ex{
font-family:'JetBrains Mono',monospace;
color:var(--str); font-size:11.5px;
}
table.fntbl .fn-out{
font-family:'JetBrains Mono',monospace;
color:var(--num); font-size:11.5px;
}
table.fntbl .fn-desc{ color:var(--text2); }
/* ═══════════════════════════════════════
BOTTOM NAV
═══════════════════════════════════════ */
.nav-bar {
position:relative;z-index:50;
display:flex; align-items:center; justify-content:center; gap:14px;
padding:12px 24px;
background:var(--bg2); border-top:1px solid var(--border);
flex-shrink:0;
}
.nav-btn {
background:var(--bg3); border:1px solid var(--border);
color:var(--text2); padding:9px 22px;
border-radius:10px; font-family:'Hind Siliguri',sans-serif;
font-size:13px; font-weight:600; cursor:pointer;
display:flex;align-items:center;gap:7px;
transition:all .22s;
}
.nav-btn:hover:not(:disabled){
background:linear-gradient(135deg,var(--accent2),var(--accent));
color:#fff; border-color:transparent;
box-shadow:0 4px 18px rgba(0,200,255,.3);
transform:translateY(-1px);
}
.nav-btn:active:not(:disabled){ transform:translateY(0); }
.nav-btn:disabled{ opacity:.28; cursor:not-allowed; }
.slide-counter {
font-family:'JetBrains Mono',monospace;
font-size:12px; color:var(--text3);
min-width:70px; text-align:center;
}
.slide-counter .cur { color:var(--accent); font-weight:700; font-size:18px; }
.dot-row { display:flex; gap:5px; align-items:center; }
.dot {
width:7px; height:7px; border-radius:50%;
background:var(--border2); cursor:pointer;
transition:all .22s;
}
.dot.active {
background:var(--accent); transform:scale(1.5);
box-shadow:0 0 8px var(--accent);
}
.dot:hover:not(.active){ background:var(--accent2); transform:scale(1.2); }
/* ═══════════════════════════════════════
WINDOW FUNCTION DIAGRAM
═══════════════════════════════════════ */
.window-diagram {
background:var(--bg3); border:1px solid var(--border);
border-radius:12px; padding:16px; margin:10px 0;
}
.window-diagram .wrow {
display:flex; align-items:center; gap:10px; margin:4px 0;
font-family:'JetBrains Mono',monospace; font-size:12px;
}
.window-diagram .wrow .wbadge {
padding:3px 10px; border-radius:6px; font-size:11px; font-weight:600;
}
.wb-part { background:rgba(255,110,180,.15); color:var(--pink); border:1px solid rgba(255,110,180,.3); }
.wb-ord { background:rgba(255,204,68,.15); color:var(--gold); border:1px solid rgba(255,204,68,.3); }
.wb-frame{ background:rgba(0,229,184,.15); color:var(--accent3);border:1px solid rgba(0,229,184,.3); }
.wb-fn { background:rgba(0,200,255,.15); color:var(--accent); border:1px solid rgba(0,200,255,.3); }
/* ═══════════════════════════════════════
SLIDE-SPECIFIC: Summary checkmarks
═══════════════════════════════════════ */
.check-grid { display:flex; flex-direction:column; gap:8px; }
.check-item {
display:flex; align-items:flex-start; gap:10px;
font-size:13.5px; color:var(--text2); line-height:1.6;
padding:8px 12px;
background:var(--card2); border:1px solid var(--border);
border-radius:9px;
animation: fadeUp .4s ease backwards;
transition:border-color .2s;
}
.check-item:hover{ border-color:var(--accent3); }
.check-item .ck { color:var(--accent3); font-size:16px; flex-shrink:0; }
.check-item strong{ color:var(--text); }
</style>
</head>
<body>
<!-- PARTICLES -->
<div class="particles" id="particles"></div>
<!-- TOP BAR -->
<div class="topbar">
<div class="logo">
<div class="logo-box">Λ</div>
Oracle SQL
</div>
<div class="topbar-title" id="topTitle">
<span class="chapter" id="chapterLabel">CH 00</span>
<span id="slideTitle">স্বাগতম</span>
</div>
<div class="topbar-right">
<button class="theme-btn" onclick="toggleTheme()">
<span id="themeIcon">☀️</span>
<span id="themeLabel">লাইট মোড</span>
</button>
</div>
</div>
<!-- PROGRESS -->
<div class="progress-track">
<div class="progress-fill" id="progressFill" style="width:0%"></div>
</div>
<!-- STAGE -->
<div class="stage">
<div class="slide-viewport" id="vp">
<!-- ══════════════════════════════════════
SLIDE 01 — TITLE
══════════════════════════════════════ -->
<div class="slide active" data-ch="CH 00" data-title="স্বাগতম">
<div class="slide-glow"></div>
<div class="title-hero">
<div class="hero-badge"><span class="live-dot"></span>Oracle Database 21c — বাংলা লেকচার সিরিজ</div>
<div class="title-main">Oracle SQL<br>সম্পূর্ণ গাইড</div>
<p class="title-sub">SQL-এর মূল ধারণা থেকে শুরু করে এডভান্সড ফাংশন, জয়েন, সাবকোয়েরি এবং উইন্ডো ফাংশন পর্যন্ত — বাংলায় সম্পূর্ণ ইন্টারেক্টিভ লেকচার।</p>
<div class="topic-chips">
<span class="chip">SELECT</span><span class="chip">JOIN</span>
<span class="chip">GROUP BY</span><span class="chip">Subquery</span>
<span class="chip">Scalar Functions</span><span class="chip">Aggregate Functions</span>
<span class="chip">String Functions</span><span class="chip">Date & Time</span>
<span class="chip">Conversion</span><span class="chip">Analytic / Window</span>
<span class="chip">DDL / DML</span><span class="chip">Index</span>
</div>
</div>
</div>
<!-- ══════════════════════════════════════
SLIDE 02 — SQL কী?
══════════════════════════════════════ -->
<div class="slide" data-ch="CH 01" data-title="SQL কী?">
<div class="slide-glow"></div>
<div class="slide-tag"><span class="tag-pill">অধ্যায় ০১</span></div>
<h2 class="shead">SQL কী এবং Oracle কেন? <span class="hl">ভূমিকা</span></h2>
<p class="ssub">SQL (Structured Query Language) হলো রিলেশনাল ডেটাবেজের সাথে যোগাযোগের মানসম্মত ভাষা। Oracle Database বিশ্বের সবচেয়ে শক্তিশালী RDBMS গুলোর একটি।</p>
<div class="card-grid">
<div class="ccard"><div class="ci">🗄️</div><div class="ct">DDL</div><div class="cb2">Data Definition — CREATE, ALTER, DROP — স্ট্রাকচার তৈরি ও পরিবর্তন</div></div>
<div class="ccard"><div class="ci">✏️</div><div class="ct">DML</div><div class="cb2">Data Manipulation — INSERT, UPDATE, DELETE — ডেটা পরিবর্তন</div></div>
<div class="ccard"><div class="ci">🔍</div><div class="ct">DQL</div><div class="cb2">Data Query — SELECT — ডেটা অনুসন্ধান ও পুনরুদ্ধার</div></div>
<div class="ccard"><div class="ci">🔒</div><div class="ct">DCL</div><div class="cb2">Data Control — GRANT, REVOKE — অনুমতি নিয়ন্ত্রণ</div></div>
<div class="ccard"><div class="ci">🔄</div><div class="ct">TCL</div><div class="cb2">Transaction Control — COMMIT, ROLLBACK — লেনদেন নিয়ন্ত্রণ</div></div>
<div class="ccard"><div class="ci">⚡</div><div class="ct">Oracle বৈশিষ্ট্য</div><div class="cb2">ROWNUM, CONNECT BY, Analytic Functions, PL/SQL এক্সটেনশন</div></div>
</div>
<div class="ibox info"><span class="ibox-icon">💡</span>Oracle SQL ANSI মান মেনে চলে কিন্তু অনেক শক্তিশালী নিজস্ব extension যোগ করে যেমন ROWNUM, DUAL table, CONNECT BY ইত্যাদি।</div>
</div>
<!-- ══════════════════════════════════════
SLIDE 03 — SELECT
══════════════════════════════════════ -->
<div class="slide" data-ch="CH 02" data-title="SELECT স্টেটমেন্ট">
<div class="slide-glow"></div>
<div class="slide-tag"><span class="tag-pill">অধ্যায় ০২</span></div>
<h2 class="shead"><span class="hl">SELECT</span> স্টেটমেন্ট — ডেটা অনুসন্ধান</h2>
<p class="ssub">SELECT হলো SQL-এর সবচেয়ে মৌলিক কমান্ড। এটি দিয়ে এক বা একাধিক টেবিল থেকে ডেটা পুনরুদ্ধার করা হয়।</p>
<div class="syntax">
<span class="sr">SELECT</span> col1, col2
<span class="sr">FROM</span> table_name
[<span class="so">WHERE</span> condition]
[<span class="so">ORDER BY</span> col]
[<span class="so">FETCH FIRST</span> n <span class="so">ROWS ONLY</span>]
</div>
<div class="two-col">
<div>
<div class="cb">
<div class="cb-header"><div class="cb-dots"><span></span><span></span><span></span></div><div class="cb-lang">Oracle SQL</div><button class="cb-copy" onclick="copyCode(this)">copy</button></div>
<div class="cb-body"><span class="ln">1</span><span class="cm">-- HR স্কিমা থেকে কর্মচারী তথ্য</span>
<span class="ln">2</span><span class="kw">SELECT</span> employee_id,
<span class="ln">3</span> first_name,
<span class="ln">4</span> last_name,
<span class="ln">5</span> salary
<span class="ln">6</span> <span class="kw">FROM</span> employees
<span class="ln">7</span> <span class="kw">WHERE</span> salary <span class="op">></span> <span class="num">5000</span>
<span class="ln">8</span> <span class="kw">AND</span> department_id <span class="op">=</span> <span class="num">60</span>
<span class="ln">9</span> <span class="kw">ORDER BY</span> salary <span class="kw">DESC</span>
<span class="ln">10</span><span class="kw">FETCH FIRST</span> <span class="num">5</span> <span class="kw">ROWS ONLY</span>;</div>
</div>
</div>
<div>
<div class="res-label">ফলাফল (Result)</div>
<div class="res-wrap">
<table class="rt">
<tr><th>EMPLOYEE_ID</th><th>FIRST_NAME</th><th>SALARY</th></tr>
<tr><td>103</td><td>Alexander</td><td>9000</td></tr>
<tr><td>104</td><td>Bruce</td><td>6000</td></tr>
<tr><td>105</td><td>David</td><td>4800</td></tr>
</table>
</div>
<div class="ibox warn"><span class="ibox-icon">⚠️</span>SELECT * ব্যবহার এড়িয়ে চলুন — শুধু প্রয়োজনীয় কলাম নির্দিষ্ট করুন।</div>
</div>
</div>
</div>
<!-- ══════════════════════════════════════
SLIDE 04 — WHERE & Operators
══════════════════════════════════════ -->
<div class="slide" data-ch="CH 02" data-title="WHERE ক্লজ">
<div class="slide-glow"></div>
<div class="slide-tag"><span class="tag-pill">অধ্যায় ০২</span></div>
<h2 class="shead"><span class="hl">WHERE</span> ক্লজ ও অপারেটর</h2>
<p class="ssub">WHERE ক্লজ দিয়ে শর্ত অনুযায়ী সারি ফিল্টার করা হয়। বিভিন্ন ধরনের অপারেটর ব্যবহার করে জটিল শর্ত তৈরি করা যায়।</p>
<div class="two-col">
<div>
<div class="cb">
<div class="cb-header"><div class="cb-dots"><span></span><span></span><span></span></div><div class="cb-lang">WHERE অপারেটর</div><button class="cb-copy" onclick="copyCode(this)">copy</button></div>
<div class="cb-body" style="font-size:12px"><span class="ln">1</span><span class="cm">-- BETWEEN অপারেটর</span>
<span class="ln">2</span><span class="kw">WHERE</span> salary <span class="kw">BETWEEN</span> <span class="num">3000</span> <span class="kw">AND</span> <span class="num">8000</span>
<span class="ln">3</span><span class="cm">-- IN তালিকা</span>
<span class="ln">4</span><span class="kw">WHERE</span> dept_id <span class="kw">IN</span> (<span class="num">10</span>, <span class="num">20</span>, <span class="num">30</span>)
<span class="ln">5</span><span class="cm">-- LIKE প্যাটার্ন</span>
<span class="ln">6</span><span class="kw">WHERE</span> last_name <span class="kw">LIKE</span> <span class="str">'S%'</span>
<span class="ln">7</span><span class="cm">-- NULL চেক</span>
<span class="ln">8</span><span class="kw">WHERE</span> commission_pct <span class="kw">IS NOT NULL</span>
<span class="ln">9</span><span class="cm">-- NOT অপারেটর</span>
<span class="ln">10</span><span class="kw">WHERE</span> dept_id <span class="kw">NOT IN</span> (<span class="num">40</span>, <span class="num">50</span>)</div>
</div>
</div>
<div>
<ul class="slist">
<li><span class="bul">=</span><div><strong>সমতা</strong> — নির্দিষ্ট মানের সাথে মিল যাচাই</div></li>
<li><span class="bul">≠</span><div><strong>!= বা <></strong> — অসমান তুলনা</div></li>
<li><span class="bul">%</span><div><strong>LIKE %</strong> — যেকোনো অক্ষর; _ একটি অক্ষর</div></li>
<li><span class="bul">∈</span><div><strong>IN (...)</strong> — তালিকার যেকোনো মানের সাথে মিল</div></li>
<li><span class="bul">∅</span><div><strong>IS NULL</strong> — NULL মান যাচাই করে</div></li>
</ul>
<div class="ibox err" style="margin-top:12px"><span class="ibox-icon">🚫</span>NULL-এর সাথে কখনো = বা != ব্যবহার করবেন না — সবসময় IS NULL / IS NOT NULL লিখুন।</div>
</div>
</div>
</div>
<!-- ══════════════════════════════════════
SLIDE 05 — JOINs
══════════════════════════════════════ -->
<div class="slide" data-ch="CH 03" data-title="JOIN — টেবিল যুক্ত করা">
<div class="slide-glow"></div>
<div class="slide-tag"><span class="tag-pill">অধ্যায় ০৩</span></div>
<h2 class="shead">SQL <span class="hl">JOIN</span> — একাধিক টেবিল একত্রিত</h2>
<p class="ssub">JOIN দিয়ে একটি সাধারণ কলামের ভিত্তিতে দুই বা ততোধিক টেবিলের সারি একত্রিত করা হয়।</p>
<div class="two-col">
<div>
<div class="join-vis">
<div class="jc jc-l">employees<span class="jc-label">বাম টেবিল</span></div>
<div class="jc jc-r">departments<span class="jc-label">ডান টেবিল</span></div>
</div>
<div class="join-tabs" id="joinTabs">
<div class="jtab active" onclick="doJoin('inner',this)">INNER</div>
<div class="jtab" onclick="doJoin('left',this)">LEFT</div>
<div class="jtab" onclick="doJoin('right',this)">RIGHT</div>
<div class="jtab" onclick="doJoin('full',this)">FULL OUTER</div>
<div class="jtab" onclick="doJoin('cross',this)">CROSS</div>
</div>
</div>
<div>
<div class="cb" id="joinCB">
<div class="cb-header"><div class="cb-dots"><span></span><span></span><span></span></div><div class="cb-lang" id="joinLabel">INNER JOIN</div><button class="cb-copy" onclick="copyCode(this)">copy</button></div>
<div class="cb-body" style="font-size:12px" id="joinBody"><span class="kw">SELECT</span> e.first_name,
d.department_name
<span class="kw">FROM</span> employees e
<span class="kw">INNER JOIN</span> departments d
<span class="kw">ON</span> e.department_id
<span class="op">=</span> d.department_id;</div>