diff --git a/CHANGELOG.md b/CHANGELOG.md
index c618045..c61ed9e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -46,6 +46,7 @@
 - New #316: Realize `Schema::loadResultColumn()` method (@Tigrov)
 - New #323: Use `DateTimeColumn` class for datetime column types (@Tigrov)
 - Enh #324: Refactor `Command::insertWithReturningPks()` method (@Tigrov)
+- Chg #326: Add alias in `DQLQueryBuilder::selectExists()` method for consistency with other DBMS (@Tigrov)
 
 ## 1.3.0 March 21, 2024
 
diff --git a/src/DQLQueryBuilder.php b/src/DQLQueryBuilder.php
index ae5bedf..84db066 100644
--- a/src/DQLQueryBuilder.php
+++ b/src/DQLQueryBuilder.php
@@ -57,7 +57,7 @@ public function buildOrderByAndLimit(
 
     public function selectExists(string $rawSql): string
     {
-        return 'SELECT CASE WHEN EXISTS(' . $rawSql . ') THEN 1 ELSE 0 END FROM DUAL';
+        return 'SELECT CASE WHEN EXISTS(' . $rawSql . ') THEN 1 ELSE 0 END AS "0" FROM DUAL';
     }
 
     public function buildFrom(array|null $tables, array &$params): string
diff --git a/tests/Provider/QueryBuilderProvider.php b/tests/Provider/QueryBuilderProvider.php
index e4de560..a381a66 100644
--- a/tests/Provider/QueryBuilderProvider.php
+++ b/tests/Provider/QueryBuilderProvider.php
@@ -119,17 +119,6 @@ public static function insert(): array
         return $insert;
     }
 
-    public static function selectExist(): array
-    {
-        $selectExist = parent::selectExist();
-
-        $selectExist[0][1] = <<<SQL
-        SELECT CASE WHEN EXISTS(SELECT 1 FROM `table` WHERE `id` = 1) THEN 1 ELSE 0 END FROM DUAL
-        SQL;
-
-        return $selectExist;
-    }
-
     public static function upsert(): array
     {
         $concreteData = [
diff --git a/tests/QueryBuilderTest.php b/tests/QueryBuilderTest.php
index f93148b..fc70e8e 100644
--- a/tests/QueryBuilderTest.php
+++ b/tests/QueryBuilderTest.php
@@ -451,10 +451,16 @@ public function testResetSequenceCompositeException(): void
         $db->close();
     }
 
-    #[DataProviderExternal(QueryBuilderProvider::class, 'selectExist')]
-    public function testSelectExists(string $sql, string $expected): void
+    public function testSelectExists(): void
     {
-        parent::testSelectExists($sql, $expected);
+        $db = $this->getConnection();
+        $qb = $db->getQueryBuilder();
+
+        $sql = 'SELECT 1 FROM "customer" WHERE "id" = 1';
+        // Alias is not required in Oracle, but it is added for consistency with other DBMS.
+        $expected = 'SELECT CASE WHEN EXISTS(SELECT 1 FROM "customer" WHERE "id" = 1) THEN 1 ELSE 0 END AS "0" FROM DUAL';
+
+        $this->assertSame($expected, $qb->selectExists($sql));
     }
 
     #[DataProviderExternal(QueryBuilderProvider::class, 'update')]