diff --git a/framework/yii/db/redis/Connection.php b/framework/yii/db/redis/Connection.php
index ea59f22..68b40d3 100644
--- a/framework/yii/db/redis/Connection.php
+++ b/framework/yii/db/redis/Connection.php
@@ -13,7 +13,6 @@ use \yii\base\Component;
 use yii\base\InvalidConfigException;
 use \yii\db\Exception;
 use yii\helpers\Inflector;
-use yii\helpers\StringHelper;
 
 /**
  *
diff --git a/tests/unit/framework/db/pgsql/PostgreSQLQueryBuilderTest.php b/tests/unit/framework/db/pgsql/PostgreSQLQueryBuilderTest.php
index bf2dd73..c7bfeed 100644
--- a/tests/unit/framework/db/pgsql/PostgreSQLQueryBuilderTest.php
+++ b/tests/unit/framework/db/pgsql/PostgreSQLQueryBuilderTest.php
@@ -12,10 +12,10 @@ class PostgreSQLQueryBuilderTest extends QueryBuilderTest
 	public function columnTypes()
 	{
 		return array(
-			array(Schema::TYPE_PK, 'serial not null primary key'),
-			array(Schema::TYPE_PK . '(8)', 'serial not null primary key'),
-			array(Schema::TYPE_PK . ' CHECK (value > 5)', 'serial not null primary key CHECK (value > 5)'),
-			array(Schema::TYPE_PK . '(8) CHECK (value > 5)', 'serial not null primary key CHECK (value > 5)'),
+			array(Schema::TYPE_PK, 'serial NOT NULL PRIMARY KEY'),
+			array(Schema::TYPE_PK . '(8)', 'serial NOT NULL PRIMARY KEY'),
+			array(Schema::TYPE_PK . ' CHECK (value > 5)', 'serial NOT NULL PRIMARY KEY CHECK (value > 5)'),
+			array(Schema::TYPE_PK . '(8) CHECK (value > 5)', 'serial NOT NULL PRIMARY KEY CHECK (value > 5)'),
 			array(Schema::TYPE_STRING, 'varchar(255)'),
 			array(Schema::TYPE_STRING . '(32)', 'varchar(32)'),
 			array(Schema::TYPE_STRING . ' CHECK (value LIKE "test%")', 'varchar(255) CHECK (value LIKE "test%")'),