diff --git a/src/PDO/CommandPDOOracle.php b/src/PDO/CommandPDOOracle.php
index 54d6fb5..082e988 100644
--- a/src/PDO/CommandPDOOracle.php
+++ b/src/PDO/CommandPDOOracle.php
@@ -11,8 +11,6 @@
 use Yiisoft\Db\Connection\ConnectionPDOInterface;
 use Yiisoft\Db\Exception\Exception;
 use Yiisoft\Db\Query\QueryBuilderInterface;
-use Yiisoft\Db\Schema\QuoterInterface;
-use Yiisoft\Db\Schema\SchemaInterface;
 
 /**
  * Command represents an Oracle SQL statement to be executed against a database.
diff --git a/src/PDO/QueryBuilderPDOOracle.php b/src/PDO/QueryBuilderPDOOracle.php
index 7756c9d..2df30de 100644
--- a/src/PDO/QueryBuilderPDOOracle.php
+++ b/src/PDO/QueryBuilderPDOOracle.php
@@ -137,7 +137,7 @@ public function alterColumn(string $table, string $column, string $type): string
      *
      * @param string $table the table that new rows will be inserted into.
      * @param array $columns the column names.
-     * @param iterable|Generator $rows the rows to be batched inserted into the table.
+     * @param Generator|iterable $rows the rows to be batched inserted into the table.
      * @param array $params
      *
      * @throws \Exception|InvalidArgumentException|InvalidConfigException|NotSupportedException
diff --git a/src/PDO/SchemaPDOOracle.php b/src/PDO/SchemaPDOOracle.php
index b752bed..d7e3254 100644
--- a/src/PDO/SchemaPDOOracle.php
+++ b/src/PDO/SchemaPDOOracle.php
@@ -399,7 +399,7 @@ protected function findColumns(TableSchema $table): bool
      *
      * @throws Exception|InvalidConfigException|Throwable
      *
-     * @return int|null|string whether the sequence exists.
+     * @return int|string|null whether the sequence exists.
      *
      * @internal TableSchema `$table->getName()` the table schema.
      */
diff --git a/tests/QueryBuilderTest.php b/tests/QueryBuilderTest.php
index 937c93f..cfd932b 100644
--- a/tests/QueryBuilderTest.php
+++ b/tests/QueryBuilderTest.php
@@ -6,10 +6,7 @@
 
 use Closure;
 use Yiisoft\Arrays\ArrayHelper;
-use Yiisoft\Db\Connection\ConnectionInterface;
-use Yiisoft\Db\Oracle\PDO\QueryBuilderPDOOracle;
 use yiisoft\Db\Query\Query;
-use Yiisoft\Db\Query\QueryBuilderInterface;
 use Yiisoft\Db\TestSupport\TestQueryBuilderTrait;
 
 /**
@@ -320,5 +317,4 @@ public function testUpsert(string $table, $insertColumns, $updateColumns, $expec
             $this->assertIsOneOf($actualParams, $expectedParams);
         }
     }
-
 }
diff --git a/tests/TestCase.php b/tests/TestCase.php
index d0c374e..9d371d2 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -6,7 +6,6 @@
 
 use Exception;
 use PHPUnit\Framework\TestCase as AbstractTestCase;
-use Yiisoft\Db\Connection\ConnectionInterface;
 use Yiisoft\Db\Driver\PDODriver;
 use Yiisoft\Db\Oracle\PDO\ConnectionPDOOracle;
 use Yiisoft\Db\TestSupport\TestTrait;