diff --git a/src/SelectExpression/SubQuerySelectExpression.php b/src/SelectExpression/SubQuerySelectExpression.php
index 1afd488..594c7db 100644
--- a/src/SelectExpression/SubQuerySelectExpression.php
+++ b/src/SelectExpression/SubQuerySelectExpression.php
@@ -1,7 +1,7 @@
 <?php
 namespace Packaged\QueryBuilder\SelectExpression;
 
-use Packaged\QueryBuilder\Assembler\QueryAssembler;
+use Packaged\Helpers\Strings;
 use Packaged\QueryBuilder\SelectExpression\Traits\AliasTrait;
 use Packaged\QueryBuilder\Statement\QueryStatement;
 
@@ -24,7 +24,7 @@ public function setQuery(QueryStatement $query, $alias = null)
     $this->_alias = $alias;
     if($this->_alias === null)
     {
-      $this->_alias = substr(md5(QueryAssembler::stringify($query)), 0, 6);
+      $this->_alias = 't' . Strings::randomString(5);
     }
     $this->_query = $query;
     return $this;
@@ -32,7 +32,7 @@ public function setQuery(QueryStatement $query, $alias = null)
 
   public static function create(QueryStatement $query, $alias = null)
   {
-    $expression = new static;
+    $expression = new static();
     $expression->setQuery($query, $alias);
     return $expression;
   }
diff --git a/tests/Assembler/MySQL/MySQLAssemblerTest.php b/tests/Assembler/MySQL/MySQLAssemblerTest.php
index 9eeeae6..c922275 100644
--- a/tests/Assembler/MySQL/MySQLAssemblerTest.php
+++ b/tests/Assembler/MySQL/MySQLAssemblerTest.php
@@ -2,9 +2,15 @@
 namespace Packaged\Tests\QueryBuilder\Assembler\MySQL;
 
 use Packaged\QueryBuilder\Assembler\MySQL\MySQLAssembler;
+use Packaged\QueryBuilder\Builder\QueryBuilder;
 use Packaged\QueryBuilder\Expression\FieldExpression;
+use Packaged\QueryBuilder\Expression\StringExpression;
 use Packaged\QueryBuilder\Expression\TableExpression;
+use Packaged\QueryBuilder\Predicate\GreaterThanPredicate;
 use Packaged\QueryBuilder\SelectExpression\FieldSelectExpression;
+use Packaged\QueryBuilder\SelectExpression\MatchSelectExpression;
+use Packaged\QueryBuilder\SelectExpression\MaxSelectExpression;
+use Packaged\QueryBuilder\SelectExpression\SubQuerySelectExpression;
 
 class MySQLAssemblerTest extends \PHPUnit_Framework_TestCase
 {
@@ -43,4 +49,29 @@ public function testSelectField()
       )
     );
   }
+
+  public function testSubQuery()
+  {
+    $subQuery = QueryBuilder::select(
+      FieldSelectExpression::create('articleFid'),
+      MatchSelectExpression::create(FieldExpression::create('term'), StringExpression::create('search'))
+        ->setAlias('score')
+    )
+      ->from('search_terms')
+      ->having(GreaterThanPredicate::create('score', 0));
+
+    $subQueryText = 'SELECT `articleFid`, MATCH (`term`) AGAINST ("search") AS `score` FROM `search_terms` HAVING `score` > 0';
+    $this->assertEquals($subQueryText, MySQLAssembler::stringify($subQuery));
+
+    $query = QueryBuilder::select(
+      FieldSelectExpression::create('articleFid'),
+      MaxSelectExpression::createWithAlias('score', 'score')
+    )
+      ->from(SubQuerySelectExpression::create($subQuery, 'x'))
+      ->groupBy('articleFid')->orderBy(['score' => 'DESC']);
+    $this->assertEquals(
+      'SELECT `articleFid`, MAX(`score`) AS `score` FROM (' . $subQueryText . ') AS `x` GROUP BY `articleFid` ORDER BY `score` DESC',
+      MySQLAssembler::stringify($query)
+    );
+  }
 }
diff --git a/tests/SelectExpression/SubQuerySelectExpressionTest.php b/tests/SelectExpression/SubQuerySelectExpressionTest.php
index 02f37d5..20959dc 100644
--- a/tests/SelectExpression/SubQuerySelectExpressionTest.php
+++ b/tests/SelectExpression/SubQuerySelectExpressionTest.php
@@ -34,37 +34,23 @@ public function testAssemble()
     $selector = new SubQuerySelectExpression();
     $selector->setQuery($statement);
     $this->assertEquals(
-      '(SELECT * FROM tbl) AS ' . substr(
-        md5(QueryAssembler::stringify($statement)),
-        0,
-        6
-      ),
+      '(SELECT * FROM tbl) AS ' . $selector->getAlias(),
       QueryAssembler::stringify($selector)
     );
 
     $selector = SubQuerySelectExpression::create($statement)->setAlias(null);
-    $this->assertEquals(
-      '(SELECT * FROM tbl)',
-      QueryAssembler::stringify($selector)
-    );
+    $this->assertEquals('(SELECT * FROM tbl)', QueryAssembler::stringify($selector));
   }
 
   public function testStatic()
   {
     $statement = $this->_basicQuery();
+    $subQuery = SubQuerySelectExpression::create($statement, 'query');
+    $this->assertEquals('(SELECT * FROM tbl) AS query', QueryAssembler::stringify($subQuery));
+
     $this->assertEquals(
-      '(SELECT * FROM tbl) AS query',
-      QueryAssembler::stringify(
-        SubQuerySelectExpression::create($statement, 'query')
-      )
-    );
-    $this->assertEquals(
-      '(SELECT * FROM tbl) AS ' . substr(
-        md5(QueryAssembler::stringify($statement)),
-        0,
-        6
-      ),
-      QueryAssembler::stringify(SubQuerySelectExpression::create($statement))
+      '(SELECT * FROM tbl) AS ' . $subQuery->getAlias(),
+      QueryAssembler::stringify(SubQuerySelectExpression::create($statement)->setAlias('query'))
     );
   }
 }