刘弘扬的博客

select c.userCrowd_user_id from tab_usercrowd c where c.userCrowd_Id=’6755f9a4-e27f-48fc-88e2-59c1de9c9247’ order by rand() limit 1

查询两张表 并且对为空的值做默认值 select u.User_pictureUrl,u.User_phone,u.ID as userId,u.user_nickname,IFNULL(f.userFriend_status,3)as status ,IFNULL(f.userFriend_comment,' ')as userFriend_comment,IFNULL(f.userF