Question

我有一个MYSQL查询，基本上我有两个表，一个叫做Leagues，另一个叫做Members，我需要从member_id列的成员表中检索名称，用户名，密码=到的member_id列联赛表，联赛表中的league_id ='5'。

我真的不知道如何编写这段代码以便它可以工作？任何帮助都会很棒。

Answer 1

基本联接是必要的：

select name, username, password from Leagues, Members 
       where Leagues.member_id = Members.member_id and league_id = 5

或者，您可以使用sql常用的简写方法：

select name, username, password from Leagues lg, Members m 
       where lg.member_id = m.member_id and lg.league_id = 5

请注意，仅当列名在连接表之间不唯一时才需要此“速记”。

祝你好运！ -Knunk

Answer 2

select m.username, m.password, m.name 
from Leagues l 
inner join Members m on (m.member_id=l.member_id)
where l.league_id=5

此查询将返回您的结果。

Answer 3

SELECT
  name,
  username, 
  password
FROM Members JOIN Leagues ON Members.member_id = Leagues.member_id
WHERE Leagues.league_id = 5

Answer 4

SELECT members.name, members.username, members.password 
FROM  members
INNER JOIN Leagues  ON(Leagues.member_id = members.member_id)
WHERE Leagues.league_id = 5

Answer 5

select
  m.name, m.username, m.password 
from 
  members m, 
  leagues l
where
  m.member_id = l.member_id and
  league_id = 5;

Answer 6

SELECT DISTINCT M.name, M.username, M.password
FROM Leagues AS L
INNER JOIN Members AS M
ON L.member_id = M.member_id
WHERE league_id = 5

MYSQL查询问题

6 个答案: