(SELECT wr_id, wr_subject, 'bfood' as bo_table FROM g5_write_bfood WHERE wr_datetime BETWEEN '2020-08-30' AND '2020-09-29' AND wr_id = wr_parent ) UNION (SELECT wr_id, wr_subject, 'food' as bo_table FROM g5_write_food WHERE wr_datetime BETWEEN '2020-08-30' AND '2020-09-29' AND wr_id = wr_parent ) UNION (SELECT wr_id, wr_subject, 'review' as bo_table FROM g5_write_review WHERE wr_datetime BETWEEN '2020-08-30' AND '2020-09-29' AND wr_id = wr_parent ) ORDER BY rand() LIMIT 10