1 files changed, 6 insertions, 1 deletions
diff --git a/src/Components/AlterOperation.php b/src/Components/AlterOperation.php
index b3f8e26..e3a3f9f 100644
--- a/src/Components/AlterOperation.php
+++ b/src/Components/AlterOperation.php
@@ -331,6 +331,7 @@ class AlterOperation extends Component
      * between column and table alteration
      *
      * @param string $tokenValue Value of current token
+     * @return bool
      */
     private static function checkIfColumnDefinitionKeyword($tokenValue)
     {
@@ -339,7 +340,11 @@ class AlterOperation extends Component
             'COMMENT',
             'DEFAULT',
             'CHARACTER SET',
-            'COLLATE'
+            'COLLATE',
+            'PRIMARY',
+            'UNIQUE',
+            'PRIMARY KEY',
+            'UNIQUE KEY'
         );
         // Since these options can be used for
         // both table as well as a specific column in the table