Question

我有三张桌子：sarcuser，sarcusercommittee，sarcallcourse。我需要构建一个查询，使所有没有委员会的用户（他们在sarcusercommittee中没有记录）。这是我目前的查询：

SELECT        u.firstname + ' ' + u.lastname AS name, u.dateofbirth, u.gender, LEFT(u.note, 200) AS note, c.name AS coursename
FROM            sarcuser AS u INNER JOIN
                         sarcusercommittee AS uc ON u.id = uc.user_id INNER JOIN
                         sarcallcourse AS c ON c.id = u.courseid
WHERE        ((SELECT        COUNT(id) AS Expr1
                            FROM            sarcusercommittee
                            WHERE        (user_id = u.id)) = 0)
ORDER BY name DESC

我想问题出在（ON condistion）但是没有得到它...任何帮助？注意：我使用visual studio 2010

Answer 1

SELECT          u.firstname + ' ' + u.lastname AS name, u.dateofbirth, u.gender, LEFT(u.note, 200) AS note, c.name AS coursename
FROM            sarcuser AS u 
INNER JOIN      sarcallcourse AS c 
ON              c.id = u.courseid
WHERE           u.id NOT IN (
    SELECT      uc.user_id
    FROM        sarcusercommittee AS uc
)
ORDER BY name DESC

首先，如果你不想要它的行，你不应该内联到sarcusercommittee。 Seconly我会使用sarcusercommittee过滤给NOT IN以内的用户。

select user不包含其他表sql查询中的记录

1 个答案: