diff --git a/src/Drivers/MySQL.php b/src/Drivers/MySQL.php
index ab5d81e..d1776c6 100755
--- a/src/Drivers/MySQL.php
+++ b/src/Drivers/MySQL.php
@@ -16,9 +16,10 @@
 class MySQL implements SqlDialectInterface
 {
     #[\Override]
-    public function groupConcat(string $fieldName, string $alias, ?string $orderBy): string
+    public function groupConcat(string $fieldName, string $alias, ?string $orderBy, bool $distinct = true): string
     {
-        return ", GROUP_CONCAT($fieldName ORDER BY $orderBy SEPARATOR ';') as $alias  ";  
+        $distinctStr = $distinct ? 'DISTINCT ' : '';
+        return ", GROUP_CONCAT({$distinctStr}$fieldName ORDER BY $orderBy SEPARATOR ';') as $alias  ";  
     }
 
     #[\Override]
diff --git a/src/Drivers/PgSQL.php b/src/Drivers/PgSQL.php
index 2b2cd47..7e8e849 100755
--- a/src/Drivers/PgSQL.php
+++ b/src/Drivers/PgSQL.php
@@ -16,9 +16,11 @@
 class PgSQL implements SqlDialectInterface
 {
     #[\Override]
-    public function groupConcat(string $fieldName, string $alias, ?string $orderBy): string
+    public function groupConcat(string $fieldName, string $alias, ?string $orderBy, bool $distinct = true): string
     {
-        return ", array_to_string(array_agg($fieldName ORDER BY $orderBy), ';') $alias  ";     
+        $distinctStr = $distinct ? 'DISTINCT ' : '';
+        $orderField  = $distinct ? $fieldName : ($orderBy ?? $fieldName);
+        return ", array_to_string(array_agg({$distinctStr}$fieldName ORDER BY $orderField), ';') $alias";
     }
 
     #[\Override]
diff --git a/src/Drivers/SQLite.php b/src/Drivers/SQLite.php
index 02c1cba..f993295 100755
--- a/src/Drivers/SQLite.php
+++ b/src/Drivers/SQLite.php
@@ -16,9 +16,10 @@
 class SQLite implements SqlDialectInterface
 {
     #[\Override]
-    public function groupConcat(string $fieldName, string $alias, ?string $orderBy): string
+    public function groupConcat(string $fieldName, string $alias, ?string $orderBy, bool $distinct = true): string
     {
-        return ", GROUP_CONCAT($fieldName,';') $alias  ";  
+        $distinctStr = $distinct ? 'DISTINCT ' : '';
+        return ", GROUP_CONCAT({$distinctStr}$fieldName, ';') $alias";
     }
 
     #[\Override]
diff --git a/src/Interfaces/SqlDialectInterface.php b/src/Interfaces/SqlDialectInterface.php
index 48d86ea..4dbb486 100644
--- a/src/Interfaces/SqlDialectInterface.php
+++ b/src/Interfaces/SqlDialectInterface.php
@@ -13,7 +13,7 @@
 
 interface SqlDialectInterface
 {
-    public function groupConcat(string $fieldName, string $alias, ?string $orderBy): string;
+    public function groupConcat(string $fieldName, string $alias, ?string $orderBy, bool $distinct = true): string;
     public function close(): string;
     public function integer(string $field, string $default = "", bool $autoincrement = false, string $null = "NOT NULL"): string;
     public function string(string $field, string $default = "", string $null = "NOT NULL"): string;