--- /dev/null
+DECLARE @baseSQL nvarchar(max),
+ @SQL nvarchar(max),
+ @id sysname;--
+
+SET @baseSQL = 'ALTER TABLE /*_*/categorylinks DROP CONSTRAINT ';--
+
+SELECT @id = cc.name
+FROM sys.check_constraints cc
+JOIN sys.columns c
+ ON c.object_id = cc.parent_object_id
+ AND c.column_id = cc.parent_column_id
+WHERE
+ cc.parent_object_id = OBJECT_ID('/*_*/categorylinks')
+ AND c.name = 'cl_type';--
+
+SET @SQL = @baseSQL + @id;--
+
+EXEC sp_executesql @SQL;--
+
+ALTER TABLE /*_*/categorylinks ADD CONSTRAINT cl_type_ckc CHECK (cl_type IN('page', 'subcat', 'file'));