diff --git a/framework/db/mysql/Schema.php b/framework/db/mysql/Schema.php
index 21cca273ab1..bcf11142e88 100644
--- a/framework/db/mysql/Schema.php
+++ b/framework/db/mysql/Schema.php
@@ -223,26 +223,33 @@ protected function loadTableChecks($tableName)
             return $checks;
         }
 
+        $tableRows = $this->normalizePdoRowKeyCase($tableRows, true);
+
         foreach ($tableRows as $tableRow) {
             $sql = <<<SQL
             SELECT * FROM INFORMATION_SCHEMA.CHECK_CONSTRAINTS WHERE CONSTRAINT_NAME = :constraintName
             SQL;
 
-            $checkRows = $this->db->createCommand($sql, [':constraintName' => $tableRow['CONSTRAINT_NAME']])->queryAll();
+            $checkRows = $this->db->createCommand(
+                $sql,
+                [':constraintName' => $tableRow['constraint_name']],
+            )->queryAll();
+
+            $checkRows = $this->normalizePdoRowKeyCase($checkRows, true);
 
             foreach ($checkRows as $checkRow) {
                 $matches = [];
                 $columnName = null;
 
-                if (preg_match('/\(`?([a-zA-Z0-9_]+)`?\s*[><=]/', $checkRow['CHECK_CLAUSE'], $matches)) {
+                if (preg_match('/\(`?([a-zA-Z0-9_]+)`?\s*[><=]/', $checkRow['check_clause'], $matches)) {
                     $columnName = $matches[1];
                 }
 
                 $check = new CheckConstraint(
                     [
-                        'name' => $checkRow['CONSTRAINT_NAME'],
+                        'name' => $checkRow['constraint_name'],
                         'columnNames' => $columnName,
-                        'expression' => $checkRow['CHECK_CLAUSE'],
+                        'expression' => $checkRow['check_clause'],
                     ]
                 );
                 $checks[] = $check;
diff --git a/tests/framework/db/mysql/SchemaTest.php b/tests/framework/db/mysql/SchemaTest.php
index 43a66a60b57..9c2ca835078 100644
--- a/tests/framework/db/mysql/SchemaTest.php
+++ b/tests/framework/db/mysql/SchemaTest.php
@@ -77,16 +77,12 @@ public function testGetSchemaNames()
     public function constraintsProvider()
     {
         $result = parent::constraintsProvider();
-        $result['1: check'][2] = false;
 
         $result['2: primary key'][2]->name = null;
-        $result['2: check'][2] = false;
 
         // Work aroung bug in MySQL 5.1 - it creates only this table in lowercase. O_o
         $result['3: foreign key'][2][0]->foreignTableName = new AnyCaseValue('T_constraints_2');
-        $result['3: check'][2] = false;
 
-        $result['4: check'][2] = false;
         return $result;
     }