Question

我有这个查询

select count(distinct user1_.Id) as col_0_0_ from [FriendCloseness] friendclos0_ inner join [User] user1_ on friendclos0_.User_id=user1_.Id where dateadd(d, 0, datediff(d, 0, friendclos0_.LastUpdate))=@p0 and friendclos0_.IsInvited=1 and user1_.IsDeleted=0 and user1_.Sex=@p1

表用户加入FriendCloseness 使用FriendClossness字段查询LastUpdate，IsInvited，用户字段IsDeleted，性别在哪里

表涉及查询的用户结构

用户 ID，（主键）请将isDeleted，性别，

FriendClossness Id，（主键，DBMS会自动将索引设置为主键吗？） LastUpdate（datetimeoffset）， IsInvited， User_id（外键）

我 wounder哪个字段需要索引，我想删除日期功能，方法是创建新字段“InviteDate”以仅存储日期

Answer 1

试试这个 -

SELECT col_0_0_ = COUNT(DISTINCT u.Id)
FROM (
    SELECT u.Id
    FROM dbo.[User] u
    WHERE u.IsDeleted = 0 
        AND u.Sex = @p1
    --GROUP BY u.Id
) u
JOIN (
    SELECT 
          f.[user_id]
        , LastUpdate = DATEADD(DAY, 0, DATEDIFF(DAY, 0, f.LastUpdate))
    FROM dbo.[FriendCloseness] f
    WHERE f.IsInvited = 1 
) f ON f.[user_id] = u.Id
WHERE f.LastUpdate = @p0

SqlServer 2008需要建议优化我的查询以及哪些归档到表中的索引字段

1 个答案: