diff --git a/README.md b/README.md
index 1d5995ab..f86235d6 100644
--- a/README.md
+++ b/README.md
@@ -88,16 +88,16 @@ create('profile',
 ---
 
     innerJoin(string $leftTable = null, string $rightTable = null,
-        string $leftColumn = null, string $rightColumn = null, $condition = EQ);
+        string $leftColumn = null, string $rightColumn = null, string $tableAs = null, $condition = EQ);
 
     leftJoin(string $leftTable = null, string $rightTable = null,
-        string $leftColumn = null, string $rightColumn = null, $condition = EQ);
+        string $leftColumn = null, string $rightColumn = null, string $tableAs = null, $condition = EQ);
 
     rightJoin(string $leftTable = null, string $rightTable = null,
-        string $leftColumn = null, string $rightColumn = null, $condition = EQ);
+        string $leftColumn = null, string $rightColumn = null, string $tableAs = null, $condition = EQ);
 
     fullJoin(string $leftTable = null, string $rightTable = null,
-        string $leftColumn = null, string $rightColumn = null, $condition = EQ);
+        string $leftColumn = null, string $rightColumn = null, string $tableAs = null, $condition = EQ);
 ---
 
 ```php
@@ -179,7 +179,7 @@ foreach ($result as $row) {
 $result = $db->selecting('profile', 'name, email',
     // Conditionals can also be called, stacked with other functions like:
     //  innerJoin(), leftJoin(), rightJoin(), fullJoin()
-    //      as (leftTable, rightTable, leftColumn, rightColumn, equal condition),
+    //      as (leftTable, rightTable, leftColumn, rightColumn, tableAs, equal condition),
     //  where( eq( columns, values, _AND ), like( columns, _d ) ),
     //  groupBy( columns ),
     //  having( between( columns, values1, values2 ) ),
diff --git a/lib/ezFunctions.php b/lib/ezFunctions.php
index 2fcc98c2..3c335ded 100644
--- a/lib/ezFunctions.php
+++ b/lib/ezFunctions.php
@@ -370,11 +370,12 @@ function innerJoin(
         $rightTable = '',
         $leftColumn = null,
         $rightColumn = null,
+        $tableAs = null,
         $condition = \EQ
     ) {
         $ezQuery = \getInstance();
-        return ($ezQuery instanceof DatabaseInterface)
-            ? $ezQuery->innerJoin($leftTable, $rightTable, $leftColumn, $rightColumn, $condition)
+        return ($ezQuery instanceOf DatabaseInterface)
+            ? $ezQuery->innerJoin($leftTable, $rightTable, $leftColumn, $rightColumn, $tableAs, $condition)
             : false;
     }
 
@@ -383,11 +384,12 @@ function leftJoin(
         $rightTable = '',
         $leftColumn = null,
         $rightColumn = null,
+        $tableAs = null,
         $condition = \EQ
     ) {
         $ezQuery = \getInstance();
-        return ($ezQuery instanceof DatabaseInterface)
-            ? $ezQuery->leftJoin($leftTable, $rightTable, $leftColumn, $rightColumn, $condition)
+        return ($ezQuery instanceOf DatabaseInterface)
+            ? $ezQuery->leftJoin($leftTable, $rightTable, $leftColumn, $rightColumn, $tableAs, $condition)
             : false;
     }
 
@@ -396,11 +398,12 @@ function rightJoin(
         $rightTable = '',
         $leftColumn = null,
         $rightColumn = null,
+        $tableAs = null,
         $condition = \EQ
     ) {
         $ezQuery = \getInstance();
-        return ($ezQuery instanceof DatabaseInterface)
-            ? $ezQuery->rightJoin($leftTable, $rightTable, $leftColumn, $rightColumn, $condition)
+        return ($ezQuery instanceOf DatabaseInterface)
+            ? $ezQuery->rightJoin($leftTable, $rightTable, $leftColumn, $rightColumn, $tableAs, $condition)
             : false;
     }
 
@@ -409,11 +412,12 @@ function fullJoin(
         $rightTable = '',
         $leftColumn = null,
         $rightColumn = null,
+        $tableAs = null,
         $condition = \EQ
     ) {
         $ezQuery = \getInstance();
-        return ($ezQuery instanceof DatabaseInterface)
-            ? $ezQuery->fullJoin($leftTable, $rightTable, $leftColumn, $rightColumn, $condition)
+        return ($ezQuery instanceOf DatabaseInterface)
+            ? $ezQuery->fullJoin($leftTable, $rightTable, $leftColumn, $rightColumn, $tableAs, $condition)
             : false;
     }
 
diff --git a/lib/ezQuery.php b/lib/ezQuery.php
index c037fe7d..d0a36611 100644
--- a/lib/ezQuery.php
+++ b/lib/ezQuery.php
@@ -186,6 +186,7 @@ public function innerJoin(
         string $rightTable = null,
         string $leftColumn = null,
         string $rightColumn = null,
+        string $tableAs = null,
         $condition = \EQ
     ) {
         return $this->joining(
@@ -194,6 +195,7 @@ public function innerJoin(
             $rightTable,
             $leftColumn,
             $rightColumn,
+            $tableAs,
             $condition
         );
     }
@@ -203,6 +205,7 @@ public function leftJoin(
         string $rightTable = null,
         string $leftColumn = null,
         string $rightColumn = null,
+        string $tableAs = null,
         $condition = \EQ
     ) {
         return $this->joining(
@@ -211,6 +214,7 @@ public function leftJoin(
             $rightTable,
             $leftColumn,
             $rightColumn,
+            $tableAs,
             $condition
         );
     }
@@ -220,6 +224,7 @@ public function rightJoin(
         string $rightTable = null,
         string $leftColumn = null,
         string $rightColumn = null,
+        string $tableAs = null,
         $condition = \EQ
     ) {
         return $this->joining(
@@ -228,6 +233,7 @@ public function rightJoin(
             $rightTable,
             $leftColumn,
             $rightColumn,
+            $tableAs,
             $condition
         );
     }
@@ -237,14 +243,16 @@ public function fullJoin(
         string $rightTable = null,
         string $leftColumn = null,
         string $rightColumn = null,
+        string $tableAs = null,
         $condition = \EQ
     ) {
         return $this->joining(
             'FULL',
             $leftTable,
             $rightTable,
-            $$leftColumn,
+            $leftColumn,
             $rightColumn,
+            $tableAs,
             $condition
         );
     }
@@ -269,36 +277,42 @@ public function fullJoin(
      *
      * @param string $leftColumn -
      * @param string $rightColumn -
+     * @param string $tableAs -
      *
      * @param string $condition -
      *
      * @return bool|string JOIN sql statement, false for error
-     */
+    */
     private function joining(
         String $type = \_INNER,
         string $leftTable = null,
         string $rightTable = null,
         string $leftColumn = null,
         string $rightColumn = null,
+        string $tableAs = null,
         $condition = \EQ
     ) {
         if (
             !\in_array($type, \_JOINERS)
             || !\in_array($condition, \_BOOLEAN)
             || empty($leftTable)
-            || empty($rightTable) || empty($columnFields) || empty($leftColumn)
+            || empty($rightTable)
+            || empty($leftColumn)
         ) {
             return false;
         }
 
+        if (empty($tableAs))
+            $tableAs = $rightTable;
+
         if (\is_string($leftColumn) && empty($rightColumn))
-            $onCondition = ' ON ' . $leftTable . $leftColumn . ' = ' . $rightTable . $leftColumn;
+            $onCondition = ' ON ' . $leftTable . '.' . $leftColumn . ' = ' . $tableAs . '.' . $leftColumn;
         elseif ($condition !== \EQ)
-            $onCondition = ' ON ' . $leftTable . $leftColumn . " $condition " . $rightTable . $rightColumn;
+            $onCondition = ' ON ' . $leftTable . '.' . $leftColumn . ' ' . $condition . ' ' . $tableAs . '.' . $rightColumn;
         else
-            $onCondition = ' ON ' . $leftTable . $leftColumn . ' = ' . $rightTable . $rightColumn;
+            $onCondition = ' ON ' . $leftTable . '.' . $leftColumn . ' = ' . $tableAs . '.' . $rightColumn;
 
-        return ' ' . $type . ' JOIN ' . $rightTable . $onCondition;
+        return ' ' . $type . ' JOIN ' . $rightTable . ' AS ' . $tableAs . ' ' . $onCondition;
     }
 
     public function orderBy($orderBy, $order)
diff --git a/lib/ezQueryInterface.php b/lib/ezQueryInterface.php
index d0b6bc5b..08bfe5f0 100644
--- a/lib/ezQueryInterface.php
+++ b/lib/ezQueryInterface.php
@@ -107,6 +107,7 @@ public function having(...$having);
      * @param string $rightTable -
      * @param string $leftColumn -
      * @param string $rightColumn -
+     * @param string $tableAs -
      * @param string $condition -
      *
      * @return bool|string JOIN sql statement, false for error
@@ -116,6 +117,7 @@ public function innerJoin(
         string $rightTable = null,
         string $leftColumn = null,
         string $rightColumn = null,
+        string $tableAs = null,
         $condition = \EQ
     );
 
@@ -139,6 +141,7 @@ public function innerJoin(
      * @param string $rightTable -
      * @param string $leftColumn -
      * @param string $rightColumn -
+     * @param string $tableAs -
      * @param string $condition -
      *
      * @return bool|string JOIN sql statement, false for error
@@ -148,6 +151,7 @@ public function leftJoin(
         string $rightTable = null,
         string $leftColumn = null,
         string $rightColumn = null,
+        string $tableAs = null,
         $condition = \EQ
     );
 
@@ -171,6 +175,7 @@ public function leftJoin(
      * @param string $rightTable -
      * @param string $leftColumn -
      * @param string $rightColumn -
+     * @param string $tableAs -
      * @param string $condition -
      *
      * @return bool|string JOIN sql statement, false for error
@@ -180,6 +185,7 @@ public function rightJoin(
         string $rightTable = null,
         string $leftColumn = null,
         string $rightColumn = null,
+        string $tableAs = null,
         $condition = \EQ
     );
 
@@ -202,6 +208,7 @@ public function rightJoin(
      * @param string $rightTable -
      * @param string $leftColumn -
      * @param string $rightColumn -
+     * @param string $tableAs -
      * @param string $condition -
      *
      * @return bool|string JOIN sql statement, false for error
@@ -211,6 +218,7 @@ public function fullJoin(
         string $rightTable = null,
         string $leftColumn = null,
         string $rightColumn = null,
+        string $tableAs = null,
         $condition = \EQ
     );
 
diff --git a/tests/ezFunctionsTest.php b/tests/ezFunctionsTest.php
index c0bb9fe7..e080bb21 100644
--- a/tests/ezFunctionsTest.php
+++ b/tests/ezFunctionsTest.php
@@ -7,7 +7,7 @@
 class ezFunctionsTest extends EZTestCase
 {
     protected function setUp(): void
-	{
+    {
         \clearInstance();
     }
 
@@ -58,146 +58,159 @@ public function testDropColumn()
 
     public function testEq()
     {
-        $this->assertInternalType('array', eq('field', 'data'));
+        $this->assertIsArray(eq('field', 'data'));
         $this->assertArraySubset([1 => EQ], eq('field', 'data'));
     }
 
     public function testNeq()
     {
-        $this->assertInternalType('array', neq('field', 'data'));
+        $this->assertIsArray(neq('field', 'data'));
         $this->assertArraySubset([3 => _AND], neq('field', 'data', _AND));
     }
 
     public function testNe()
     {
-        $this->assertInternalType('array', ne('field', 'data'));
+        $this->assertIsArray(ne('field', 'data'));
         $this->assertArraySubset([4 => 'extra'], ne('field', 'data', _AND, 'extra'));
     }
 
     public function testLt()
     {
-        $this->assertInternalType('array', lt('field', 'data'));
+        $this->assertIsArray(lt('field', 'data'));
         $this->assertArraySubset([2 => 'data'], lt('field', 'data'));
     }
 
     public function testLte()
     {
-        $this->assertInternalType('array', lte('field', 'data'));
+        $this->assertIsArray(lte('field', 'data'));
         $this->assertArraySubset([0 => 'field'], lte('field', 'data'));
     }
 
     public function testGt()
     {
-        $this->assertInternalType('array', gt('field', 'data'));
+        $this->assertIsArray(gt('field', 'data'));
         $this->assertArraySubset([0 => 'field'], gt('field', 'data'));
     }
 
     public function testGte()
     {
-        $this->assertInternalType('array', gte('field', 'data'));
+        $this->assertIsArray(gte('field', 'data'));
         $this->assertArraySubset([0 => 'field'], gte('field', 'data'));
     }
 
     public function testIsNull()
     {
-        $this->assertInternalType('array', isNull('field'));
+        $this->assertIsArray(isNull('field'));
         $this->assertArraySubset([2 => 'null'], isNull('field'));
     }
 
     public function testIsNotNull()
     {
-        $this->assertInternalType('array', isNotNull('field'));
+        $this->assertIsArray(isNotNull('field'));
         $this->assertArraySubset([2 => 'null'], isNotNull('field'));
     }
 
     public function testLike()
     {
-        $this->assertInternalType('array', like('field', 'data'));
+        $this->assertIsArray(like('field', 'data'));
         $this->assertArraySubset([2 => 'data'], like('field', 'data'));
     }
 
     public function testNotLike()
     {
-        $this->assertInternalType('array', notLike('field', 'data'));
+        $this->assertIsArray(notLike('field', 'data'));
         $this->assertArraySubset([2 => 'data'], notLike('field', 'data'));
     }
 
     public function testIn()
     {
-        $this->assertInternalType('array', in('field', 'data'));
+        $this->assertIsArray(in('field', 'data'));
         $this->assertArraySubset([8 => 'data6'], in('field', 'data', 'data1', 'data2', 'data3', 'data4', 'data5', 'data6'));
     }
 
     public function testNotIn()
     {
-        $this->assertInternalType('array', notIn('field', 'data'));
+        $this->assertIsArray(notIn('field', 'data'));
         $this->assertArraySubset([5 => 'data3'], notIn('field', 'data', 'data1', 'data2', 'data3', 'data4', 'data5', 'data6'));
     }
 
     public function testBetween()
     {
-        $this->assertInternalType('array', between('field', 'data', 'data2'));
+        $this->assertIsArray(between('field', 'data', 'data2'));
         $this->assertArraySubset([1 => _BETWEEN], between('field', 'data', 'data2'));
     }
 
     public function testNotBetween()
     {
-        $this->assertInternalType('array', notBetween('field', 'data', 'data2'));
+        $this->assertIsArray(notBetween('field', 'data', 'data2'));
         $this->assertArraySubset([3 => 'data2'], notBetween('field', 'data', 'data2'));
     }
 
-    public function testSetInstance() {
+    public function testSetInstance()
+    {
         $this->assertFalse(\setInstance());
         $this->assertFalse(\setInstance($this));
     }
 
-    public function testSelect() {
+    public function testSelect()
+    {
         $this->assertFalse(select(''));
     }
 
-    public function testSelect_into() {
+    public function testSelect_into()
+    {
         $this->assertFalse(select_into('field', 'data', 'data2'));
     }
 
-    public function testInsert_select() {
+    public function testInsert_select()
+    {
         $this->assertFalse(insert_select('field', 'data', 'data2'));
     }
 
-    public function testCreate_select() {
+    public function testCreate_select()
+    {
         $this->assertFalse(create_select('field', 'data', 'data2'));
     }
 
-    public function testWhere() {
+    public function testWhere()
+    {
         $this->assertFalse(where('field', 'data', 'data2'));
     }
 
-    public function testGroupBy() {
+    public function testGroupBy()
+    {
         $this->assertFalse(groupBy(''));
         $this->assertNotNull(groupBy('field'));
     }
 
-    public function testHaving() {
+    public function testHaving()
+    {
         $this->assertFalse(having('field', 'data', 'data2'));
     }
 
-    public function testOrderBy() {
+    public function testOrderBy()
+    {
         $this->assertFalse(orderBy('', 'data'));
         $this->assertNotNull(orderBy('field', 'data'));
     }
 
-    public function testInsert() {
+    public function testInsert()
+    {
         $this->assertFalse(insert('field', ['data' => 'data2']));
     }
 
-    public function testUpdate() {
+    public function testUpdate()
+    {
         $this->assertFalse(update('field', 'data', 'data2'));
     }
 
-    public function testDeleting() {
+    public function testDeleting()
+    {
         $this->assertFalse(deleting('field', 'data', 'data2'));
     }
 
-    public function testReplace() {
+    public function testReplace()
+    {
         $this->assertFalse(replace('field', ['data' => 'data2']));
     }
 }
diff --git a/tests/ezQueryTest.php b/tests/ezQueryTest.php
index 381356d1..e77ec67d 100644
--- a/tests/ezQueryTest.php
+++ b/tests/ezQueryTest.php
@@ -31,7 +31,7 @@ public function testHaving()
 
         $expect = $this->object->having(in('other_test', 'testing 1', 'testing 2', 'testing 3', 'testing 4', 'testing 5'));
 
-        $this->assertContains('HAVING', $expect);
+        $this->assertStringContainsString('HAVING', $expect);
     }
 
     public function testWhere()
@@ -41,14 +41,14 @@ public function testWhere()
 
         $expect = $this->object->where(in('where_test', 'testing 1', 'testing 2', 'testing 3', 'testing 4', 'testing 5'));
 
-        $this->assertContains('WHERE', $expect);
-        $this->assertContains('IN', $expect);
-        $this->assertContains('(', $expect);
-        $this->assertContains('testing 2\'', $expect);
-        $this->assertContains('testing 5', $expect);
-        $this->assertContains(')', $expect);
+        $this->assertStringContainsString('WHERE', $expect);
+        $this->assertStringContainsString('IN', $expect);
+        $this->assertStringContainsString('(', $expect);
+        $this->assertStringContainsString('testing 2\'', $expect);
+        $this->assertStringContainsString('testing 5', $expect);
+        $this->assertStringContainsString(')', $expect);
 
-        $this->assertContains(
+        $this->assertStringContainsString(
             'AND',
             $this->object->where(
                 array('where_test', '=', 'testing 1'),
@@ -57,7 +57,7 @@ public function testWhere()
         );
 
         $this->object->prepareOn();
-        $this->assertContains('__ez__', $this->object->where(eq('where_test', 'testing 1')));
+        $this->assertStringContainsString('__ez__', $this->object->where(eq('where_test', 'testing 1')));
         $this->assertFalse($this->object->where(like('where_test', 'fail')));
     }
 
diff --git a/tests/mysqli/mysqliTest.php b/tests/mysqli/mysqliTest.php
index cd3daad6..87618173 100644
--- a/tests/mysqli/mysqliTest.php
+++ b/tests/mysqli/mysqliTest.php
@@ -545,7 +545,7 @@ public function testWhere()
             )
         );
 
-        $this->assertContains('WHERE where_test BETWEEN \'testing 1\' AND \'testing 2\' AND test_null IS NULL', $expect);
+        $this->assertStringContainsString('WHERE where_test BETWEEN \'testing 1\' AND \'testing 2\' AND test_null IS NULL', $expect);
 
         $this->assertFalse(where(
             array('where_test', 'bad', 'testing 1', 'or'),
@@ -558,7 +558,7 @@ public function testWhere()
             like('test_null', 'null')
         );
 
-        $this->assertContains('WHERE where_test BETWEEN ' . _TAG . ' AND ' . _TAG . ' AND test_null IS NULL', $expect);
+        $this->assertStringContainsString('WHERE where_test BETWEEN ' . _TAG . ' AND ' . _TAG . ' AND test_null IS NULL', $expect);
     }
 
     public function testQuery_prepared()
diff --git a/tests/pdo/pdo_mysqlTest.php b/tests/pdo/pdo_mysqlTest.php
index 21a2e88b..dc36492c 100644
--- a/tests/pdo/pdo_mysqlTest.php
+++ b/tests/pdo/pdo_mysqlTest.php
@@ -265,6 +265,41 @@ public function testSelecting()
         $this->assertEquals(0, $this->object->query('DROP TABLE unit_test'));
     }
 
+    public function testJoins()
+    {
+        $this->assertTrue($this->object->connect('mysql:host=' . self::TEST_DB_HOST . ';dbname=' . self::TEST_DB_NAME . ';port=' . self::TEST_DB_PORT, self::TEST_DB_USER, self::TEST_DB_PASSWORD));
+        $this->object->query('CREATE TABLE unit_test(id integer, test_key varchar(50), PRIMARY KEY (ID))');
+        $this->object->insert('unit_test', array('id' => '1', 'test_key' => 'testing 1'));
+        $this->object->insert('unit_test', array('id' => '2', 'test_key' => 'testing 2'));
+        $this->object->insert('unit_test', array('id' => '3', 'test_key' => 'testing 3'));
+        $this->object->query('CREATE TABLE unit_test_child(child_id integer, child_test_key varchar(50), parent_id integer, PRIMARY KEY (child_id))');
+        $this->object->insert('unit_test', array('child_id' => '1', 'child_test_key' => 'testing child 1', 'parent_id' => '3'));
+        $this->object->insert('unit_test', array('child_id' => '2', 'child_test_key' => 'testing child 2', 'parent_id' => '2'));
+        $this->object->insert('unit_test', array('child_id' => '3', 'child_test_key' => 'testing child 3', 'parent_id' => '1'));
+
+        $result = $this->object->selecting('unit_test_child', '*', leftJoin('unit_test_child', 'unit_test', 'parent_id', 'id'));
+        $i = 1;
+        $o = 3;
+        foreach ($result as $row) {
+            $this->assertEquals($i, $row->child_id);
+            $this->assertEquals('testing child ' . $i, $row->child_test_key);
+            $this->assertEquals($o, $row->id);
+            $this->assertEquals('testing ' . $o, $row->test_key);
+            ++$i;
+            --$o;
+        }
+
+        $result = $this->object->selecting('unit_test_child', 'child.parent_id', leftJoin('unit_test_child', 'unit_test', 'parent_id', 'id', 'child'));
+        $o = 3;
+        foreach ($result as $row) {
+            $this->assertEquals($o, $row->parent_id);
+            --$o;
+        }
+
+        $this->assertEquals(0, $this->object->query('DROP TABLE unit_test'));
+        $this->assertEquals(0, $this->object->query('DROP TABLE unit_test_child'));
+    }
+
     public function testBeginTransactionCommit()
     {
         $this->object->connect();
diff --git a/tests/pdo/pdo_pgsqlTest.php b/tests/pdo/pdo_pgsqlTest.php
index add4d5c1..414b6f06 100644
--- a/tests/pdo/pdo_pgsqlTest.php
+++ b/tests/pdo/pdo_pgsqlTest.php
@@ -189,6 +189,38 @@ public function testSelecting()
         }
     }
 
+    public function testJoins()
+    {
+        $this->assertTrue($this->object->connect('pgsql:host=' . self::TEST_DB_HOST . ';dbname=' . self::TEST_DB_NAME . ';port=' . self::TEST_DB_PORT, self::TEST_DB_USER, self::TEST_DB_PASSWORD));
+        $this->object->query('CREATE TABLE unit_test(id integer, test_key varchar(50), PRIMARY KEY (ID))');
+        $this->object->insert('unit_test', array('id' => '1', 'test_key' => 'testing 1'));
+        $this->object->insert('unit_test', array('id' => '2', 'test_key' => 'testing 2'));
+        $this->object->insert('unit_test', array('id' => '3', 'test_key' => 'testing 3'));
+        $this->object->query('CREATE TABLE unit_test_child(child_id integer, child_test_key varchar(50), parent_id integer, PRIMARY KEY (child_id))');
+        $this->object->insert('unit_test', array('child_id' => '1', 'child_test_key' => 'testing child 1', 'parent_id' => '3'));
+        $this->object->insert('unit_test', array('child_id' => '2', 'child_test_key' => 'testing child 2', 'parent_id' => '2'));
+        $this->object->insert('unit_test', array('child_id' => '3', 'child_test_key' => 'testing child 3', 'parent_id' => '1'));
+
+        $result = $this->object->selecting('unit_test_child', '*', leftJoin('unit_test_child', 'unit_test', 'parent_id', 'id'));
+        $i = 1;
+        $o = 3;
+        foreach ($result as $row) {
+            $this->assertEquals($i, $row->child_id);
+            $this->assertEquals('testing child ' . $i, $row->child_test_key);
+            $this->assertEquals($o, $row->id);
+            $this->assertEquals('testing ' . $o, $row->test_key);
+            ++$i;
+            --$o;
+        }
+
+        $result = $this->object->selecting('unit_test_child', 'child.parent_id', leftJoin('unit_test_child', 'unit_test', 'parent_id', 'id', 'child'));
+        $o = 3;
+        foreach ($result as $row) {
+            $this->assertEquals($o, $row->parent_id);
+            --$o;
+        }
+    }
+
     public function testPosgreSQLDisconnect()
     {
         $this->assertTrue($this->object->connect('pgsql:host=' . self::TEST_DB_HOST . ';dbname=' . self::TEST_DB_NAME . ';port=' . self::TEST_DB_PORT, self::TEST_DB_USER, self::TEST_DB_PASSWORD));
diff --git a/tests/pdo/pdo_sqliteTest.php b/tests/pdo/pdo_sqliteTest.php
index 90c805ac..ea639af2 100644
--- a/tests/pdo/pdo_sqliteTest.php
+++ b/tests/pdo/pdo_sqliteTest.php
@@ -216,6 +216,41 @@ public function testSelecting()
         $this->assertEquals(1, $this->object->query('DROP TABLE unit_test'));
     }
 
+    public function testJoins()
+    {
+        $this->assertTrue($this->object->connect('sqlite:' . self::TEST_SQLITE_DB, '', '', array(), true));
+        $this->object->query('CREATE TABLE unit_test(id integer, test_key varchar(50), PRIMARY KEY (ID))');
+        $this->object->insert('unit_test', array('id' => '1', 'test_key' => 'testing 1'));
+        $this->object->insert('unit_test', array('id' => '2', 'test_key' => 'testing 2'));
+        $this->object->insert('unit_test', array('id' => '3', 'test_key' => 'testing 3'));
+        $this->object->query('CREATE TABLE unit_test_child(child_id integer, child_test_key varchar(50), parent_id integer, PRIMARY KEY (child_id))');
+        $this->object->insert('unit_test', array('child_id' => '1', 'child_test_key' => 'testing child 1', 'parent_id' => '3'));
+        $this->object->insert('unit_test', array('child_id' => '2', 'child_test_key' => 'testing child 2', 'parent_id' => '2'));
+        $this->object->insert('unit_test', array('child_id' => '3', 'child_test_key' => 'testing child 3', 'parent_id' => '1'));
+
+        $result = $this->object->selecting('unit_test_child', '*', leftJoin('unit_test_child', 'unit_test', 'parent_id', 'id'));
+        $i = 1;
+        $o = 3;
+        foreach ($result as $row) {
+            $this->assertEquals($i, $row->child_id);
+            $this->assertEquals('testing child ' . $i, $row->child_test_key);
+            $this->assertEquals($o, $row->id);
+            $this->assertEquals('testing ' . $o, $row->test_key);
+            ++$i;
+            --$o;
+        }
+
+        $result = $this->object->selecting('unit_test_child', 'child.parent_id', leftJoin('unit_test_child', 'unit_test', 'parent_id', 'id', 'child'));
+        $o = 3;
+        foreach ($result as $row) {
+            $this->assertEquals($o, $row->parent_id);
+            --$o;
+        }
+
+        $this->assertEquals(1, $this->object->query('DROP TABLE unit_test'));
+        $this->assertEquals(1, $this->object->query('DROP TABLE unit_test_child'));
+    }
+
     public function testSQLiteDisconnect()
     {
         $this->assertTrue($this->object->connect());
diff --git a/tests/pdo/pdo_sqlsrvTest.php b/tests/pdo/pdo_sqlsrvTest.php
index 26c022db..f3ed02b5 100644
--- a/tests/pdo/pdo_sqlsrvTest.php
+++ b/tests/pdo/pdo_sqlsrvTest.php
@@ -193,6 +193,38 @@ public function testSelecting()
         }
     }
 
+    public function testJoins()
+    {
+        $this->assertTrue($this->object->connect('sqlsrv:Server=' . self::TEST_DB_HOST . ';Database=' . self::TEST_DB_NAME, self::TEST_DB_USER, self::TEST_DB_PASSWORD));
+        $this->object->query('CREATE TABLE unit_test(id integer, test_key varchar(50), PRIMARY KEY (ID))');
+        $this->object->insert('unit_test', array('id' => '1', 'test_key' => 'testing 1'));
+        $this->object->insert('unit_test', array('id' => '2', 'test_key' => 'testing 2'));
+        $this->object->insert('unit_test', array('id' => '3', 'test_key' => 'testing 3'));
+        $this->object->query('CREATE TABLE unit_test_child(child_id integer, child_test_key varchar(50), parent_id integer, PRIMARY KEY (child_id))');
+        $this->object->insert('unit_test', array('child_id' => '1', 'child_test_key' => 'testing child 1', 'parent_id' => '3'));
+        $this->object->insert('unit_test', array('child_id' => '2', 'child_test_key' => 'testing child 2', 'parent_id' => '2'));
+        $this->object->insert('unit_test', array('child_id' => '3', 'child_test_key' => 'testing child 3', 'parent_id' => '1'));
+
+        $result = $this->object->selecting('unit_test_child', '*', leftJoin('unit_test_child', 'unit_test', 'parent_id', 'id'));
+        $i = 1;
+        $o = 3;
+        foreach ($result as $row) {
+            $this->assertEquals($i, $row->child_id);
+            $this->assertEquals('testing child ' . $i, $row->child_test_key);
+            $this->assertEquals($o, $row->id);
+            $this->assertEquals('testing ' . $o, $row->test_key);
+            ++$i;
+            --$o;
+        }
+
+        $result = $this->object->selecting('unit_test_child', 'child.parent_id', leftJoin('unit_test_child', 'unit_test', 'parent_id', 'id', 'child'));
+        $o = 3;
+        foreach ($result as $row) {
+            $this->assertEquals($o, $row->parent_id);
+            --$o;
+        }
+    }
+
     public function testSQLsrvDisconnect()
     {
         $this->assertTrue($this->object->connect('sqlsrv:Server=' . self::TEST_DB_HOST . ';Database=' . self::TEST_DB_NAME, self::TEST_DB_USER, self::TEST_DB_PASSWORD));