ป้ายใดมีขอบสีแดงและป้ายเตือนไม่จำเป็นต้องใช้ทุกตาราง
Which sign has a red border and a warning sign?It is not neccessary to use all the tables.
 table_name_68:  (text_symbol [ VARCHAR ] border [ VARCHAR ] type_of_sign [ VARCHAR) ]
SELECT text_symbol FROM table_name_68 WHERE border = "red" AND type_of_sign = "warning"