具有多个表的MySQL查询

Question

Table: UserInfoTbl
=======================
| username  | type    |
=======================
| user0001  | premium |
| user0002  | premium |
| user0003  | normal  |
| user0004  | premium |
=======================

Table: UserPvTbl
========================
| username | fUsername |
========================
| user0003 | user0002  |
| user0002 | user0001  |
| user0003 | user0001  |
========================

如何从UserInfoTbl中选择UserPvTbl的fUsername具有user0003用户名的所有信息？

编辑:这意味着我需要从UserInfoTbl中检索user0002和user0001的信息

Edit2:两个表之间的关系:UserInfoTbl.username = UserPvTbl.username

Answer 1

DroidMatt可以澄清2表关系是什么

UserInfoTbl.username = UserPvTbl.fusername
或
UserInfoTbl.username = UserPvTbl.username

维克拉姆是第一个正确的假设.否则你想要这个.

SELECT *
FROM UserInfoTbl, UserPvTbl
WHERE UserPvTbl.username = UserInfoTbl.username
AND UserPvTbl.username = 'user0003'