@ -7,7 +7,6 @@
namespace yii\db\cubrid;
use yii\base\NotSupportedException;
use yii\db\Expression;
use yii\db\TableSchema;
use yii\db\ColumnSchema;
namespace yii\db\mssql;
use yii\db\mssql\TableSchema;
/**
@ -9,7 +9,6 @@ namespace yii\db\mysql;
use yii\db\Exception;
use yii\base\InvalidParamException;
use yii\db\mysql\Schema;
* QueryBuilder is the query builder for MySQL databases.