1 files changed, 5 insertions, 0 deletions
diff --git a/src/Components/AlterOperation.php b/src/Components/AlterOperation.php
index 2540521..b3de878 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)
     {
@@ -340,6 +341,10 @@ class AlterOperation extends Component
             'DEFAULT',
             'CHARACTER SET',
             '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