select id,name from tb_rule SELECT r.id, r.name, IFNULL(tmp.count, 0) AS count, r.rule, r.remark FROM tb_rule r LEFT JOIN ( SELECT rule_id, COUNT(*) AS count FROM tb_goods GROUP BY rule_id ) tmp ON r.id = tmp.rule_id AND r.name LIKE CONCAT('%',#{name},'%') insert into tb_rule set name = #{name},rule = #{rule},remark = #{remark} update tb_rule set name = #{name},rule = #{rule},remark = #{remark} where id = #{id} delete r from tb_rule r left join (select rule_id, count(*) as count from tb_goods group by rule_id) tmp on r.id = tmp.rule_id where r.id = #{id} and ifnull(tmp.count, 0) = 0