diff --git a/src/MySQL.php b/src/MySQL.php
index 3367d21..8fe9ef8 100644
--- a/src/MySQL.php
+++ b/src/MySQL.php
@@ -19,6 +19,7 @@
 		protected string $table;
 		protected ?string $limit = null;
 		protected ?string $order_by = null;
+		protected array $filter_columns = [];
 		protected array $filter_values = [];
 		protected ?string $filter_sql = null;
 
@@ -74,6 +75,7 @@
 			// Unset filters if null was passed
 			if ($conditions === null) {
 				$this->filter_sql = null;
+				$this->filter_columns = null;
 				$this->filter_values = null;
 
 				return $this;
@@ -93,6 +95,8 @@
 
 				// Create SQL string and append values to array for prepared statement
 				foreach ($condition as $col => $operation) {
+					$this->filter_columns[] = $col;
+
 					// Assume we want an equals comparison if value is not an array
 					if (!is_array($operation)) {
 						$operation = [Operators::EQUALS->value => $operation];