select * from ( ( select id,title,`desc`,style,create_time from wi_user_notice where status = 1 and ( type = 0 or type = 4 ) order by create_time desc ) union all ( select id,title,`desc`,'0' as style,create_time from wi_user_system_message where user_id = 36 and status = 1 order by create_time desc ) ) as a order by create_time desc limit 0,15
记录一下 不同的表一起查询，带分页排序，子查询，union all连接，存在关键字同名的字段带上``符号，不同的表字段不一样补字段值，就是查询字段加入限制写死的值 ，'值[写死的值]' as 字段名 ，普通给字段取别名是 '数据库字段' as 新字段名。建议还是不要取名和mysql关键字同名的字段。
WHERE user_id = 35 and status = 1 and ((style = 1 and find_in_set(9,'so')) or (style = 2 and !find_in_set(9,'invisible'))) )
find_in_set函数里的字段带上单引号，不要用系统字段自动生成的``符号
某些情况不能带单引号，能用系统字段自动生成的``符号 具体原因不知
SELECT * FROM `wi_recruit_company_position` `p` LEFT JOIN `wi_recruit_company` `c` ON `c`.`user_id`=`p`.`user_id` WHERE `p`.`status` = 1 AND `c`.`status` = 1 AND find_in_set(8,'c.pid') 查不出
SELECT * FROM `wi_recruit_company_position` `p` LEFT JOIN `wi_recruit_company` `c` ON `c`.`user_id`=`p`.`user_id` WHERE `p`.`status` = 1 AND `c`.`status` = 1 AND find_in_set(8,`c.pid`) 报错
SELECT * FROM `wi_recruit_company_position` `p` LEFT JOIN `wi_recruit_company` `c` ON `c`.`user_id`=`p`.`user_id` WHERE `p`.`status` = 1 AND `c`.`status` = 1 AND find_in_set(8,c.pid) 查的出
SELECT * FROM `wi_recruit_company_position` `p` LEFT JOIN `wi_recruit_company` `c` ON `c`.`user_id`=`p`.`user_id` WHERE `p`.`status` = 1 AND `c`.`status` = 1 AND find_in_set(8,c.'pid') 报错
SELECT * FROM `wi_recruit_company_position` `p` LEFT JOIN `wi_recruit_company` `c` ON `c`.`user_id`=`p`.`user_id` WHERE `p`.`status` = 1 AND `c`.`status` = 1 AND find_in_set(8,`c`.`pid`) 查的出
SELECT * FROM `wi_recruit_company_position` `p` LEFT JOIN `wi_recruit_company` `c` ON `c`.`user_id`=`p`.`user_id` WHERE `p`.`status` = 1 AND `c`.`status` = 1 AND find_in_set(8,'c'.'pid') 报错
SELECT * FROM `wi_recruit_company_position` `p` LEFT JOIN `wi_recruit_company` `c` ON `c`.`user_id`=`p`.`user_id` WHERE `p`.`status` = 1 AND `c`.`status` = 1 AND find_in_set(8,'c'.pid) 报错
SELECT * FROM `wi_recruit_company_position` `p` LEFT JOIN `wi_recruit_company` `c` ON `c`.`user_id`=`p`.`user_id` WHERE `p`.`status` = 1 AND `c`.`status` = 1 AND find_in_set(8,c.'pid') 报错
SELECT * FROM `wi_recruit_company_position` `p` LEFT JOIN `wi_recruit_company` `c` ON `c`.`user_id`=`p`.`user_id` WHERE `p`.`status` = 1 AND `c`.`status` = 1 AND find_in_set(8,`c`.pid) 查的出
SELECT * FROM `wi_recruit_company_position` `p` LEFT JOIN `wi_recruit_company` `c` ON `c`.`user_id`=`p`.`user_id` WHERE `p`.`status` = 1 AND `c`.`status` = 1 AND find_in_set(8,c.`pid`) 查的出
SELECT * FROM `wi_recruit_company_position` `p` LEFT JOIN `wi_recruit_company` `c` ON `c`.`user_id`=`p`.`user_id` WHERE `p`.`status` = 1 AND `c`.`status` = 1 AND find_in_set(8,pid) 查的出
SELECT * FROM `wi_recruit_company_position` `p` LEFT JOIN `wi_recruit_company` `c` ON `c`.`user_id`=`p`.`user_id` WHERE `p`.`status` = 1 AND `c`.`status` = 1 AND find_in_set(8,`pid`) 查的出
SELECT * FROM `wi_recruit_company_position` `p` LEFT JOIN `wi_recruit_company` `c` ON `c`.`user_id`=`p`.`user_id` WHERE `p`.`status` = 1 AND `c`.`status` = 1 AND find_in_set(8,'pid') 查不出