diff --git a/src/Sql/Functors/BinaryOperatorFunctors/SqlLikeFunctor.php b/src/Sql/Functors/BinaryOperatorFunctors/SqlLikeFunctor.php
index ae98b62d..f398a2ef 100644
--- a/src/Sql/Functors/BinaryOperatorFunctors/SqlLikeFunctor.php
+++ b/src/Sql/Functors/BinaryOperatorFunctors/SqlLikeFunctor.php
@@ -1,5 +1,5 @@
 <?php
-class SqlLikeFunctor extends SqlBinaryFunctor
+class SqlLikeFunctor extends SqlBinaryOperatorFunctor
 {
 	protected function getOperator()
 	{
diff --git a/src/Sql/Functors/FunctionFunctors/SqlAbsFunctor.php b/src/Sql/Functors/FunctionFunctors/SqlAbsFunctor.php
index 6bc80136..8af6f257 100644
--- a/src/Sql/Functors/FunctionFunctors/SqlAbsFunctor.php
+++ b/src/Sql/Functors/FunctionFunctors/SqlAbsFunctor.php
@@ -1,5 +1,5 @@
 <?php
-class SqlAbsFunctor extends SqlUnaryFunctor
+class SqlAbsFunctor extends SqlFunctionFunctor
 {
 	public function getFunctionName()
 	{
diff --git a/src/Sql/Functors/FunctionFunctors/SqlExistsFunctor.php b/src/Sql/Functors/FunctionFunctors/SqlExistsFunctor.php
index 3a2b1522..d7c95608 100644
--- a/src/Sql/Functors/FunctionFunctors/SqlExistsFunctor.php
+++ b/src/Sql/Functors/FunctionFunctors/SqlExistsFunctor.php
@@ -1,5 +1,5 @@
 <?php
-class SqlExistsFunctor extends SqlUnaryFunctor
+class SqlExistsFunctor extends SqlFunctionFunctor
 {
 	public function getFunctionName()
 	{
@@ -10,4 +10,9 @@ class SqlExistsFunctor extends SqlUnaryFunctor
 	{
 		return 1;
 	}
+
+	public function getAsString()
+	{
+		return $this->getFunctionName() . ' (' . $this->subjects[0]->getAsString() . ')';
+	}
 }
diff --git a/src/Sql/Functors/FunctionFunctors/SqlMaxFunctor.php b/src/Sql/Functors/FunctionFunctors/SqlMaxFunctor.php
index d9d74e2e..fe5492ed 100644
--- a/src/Sql/Functors/FunctionFunctors/SqlMaxFunctor.php
+++ b/src/Sql/Functors/FunctionFunctors/SqlMaxFunctor.php
@@ -1,5 +1,5 @@
 <?php
-class SqlMaxFunctor extends SqlUnaryFunctor
+class SqlMaxFunctor extends SqlFunctionFunctor
 {
 	public function getFunctionName()
 	{