SQL NOT IN 可能存在性能问题

我正在尝试重构几段旧代码...我已经重构了下面的当前代码并突出显示了NOT IN语句导致性能问题。我正在尝试重写NOT IN具有左外连接的部分。

如果可能的话，任何人都可以帮忙，或者建议更好的方法吗？

SELECT 
    left(unique_id,16) AS casino_id , 
    right(unique_id,24) AS game_id   
FROM (  
        SELECT 
            distinct o.casino_id + g.game_id AS unique_id      
        FROM 
            game g INNER JOIN Bet b
            ON g.game_id = b.game_id
            INNER JOIN CasinoUser u 
            ON b.user_id = u.user_id
            INNER JOIN onewalletcasino o  
            ON u.casino_id = o.casino_id
        WHERE 
            game_start between dateadd(mi, -180, getdate()) 
            and dateadd(mi, -5, getdate())  
            and b.[status] <> 'P'
     ) t 
WHERE  
   unique_id NOT in  
    ( SELECT casino_id + game_id  AS casino_id 
      FROM 
        thirdpartysettlecalled  
      WHERE 
        [status] = 'Y')
ORDER BY casino_id 

您有一个列串联，它阻止了索引的任何使用

尝试 NOT EXISTS ，它将分别支持 2 列

SELECT distinct
     o.casino_id, g.game_id
FROM 
    game g 
    INNER JOIN 
    Bet b ON g.game_id = b.game_id
    INNER JOIN
    CasinoUser u ON b.user_id = u.user_id
    INNER JOIN
    onewalletcasino o  ON u.casino_id = o.casino_id
WHERE 
    game_start between dateadd(mi, -180, getdate()) 
                       and dateadd(mi, -5, getdate())  
    and
    b.[status] <> 'P'
    AND
    NOT EXISTS (SELECT *
           FROM 
              thirdpartysettlecalled   tp
           WHERE 
              tp.[status] = 'Y'
              AND
              tp.casino_id = o.casino_id AND tp.game_id = g.game_id)
ORDER BY
    casino_id 

之后，检查您的索引或课程...

这是一个很好的利用EXCEPT http://msdn.microsoft.com/en-us/library/ms188055.aspx也是（ORDER BY 像 UNION 一样放在最后：感谢@Damien_The_Unknowner）

SELECT distinct
     o.casino_id, g.game_id
FROM 
    game g 
    INNER JOIN 
    Bet b ON g.game_id = b.game_id
    INNER JOIN
    CasinoUser u ON b.user_id = u.user_id
    INNER JOIN
    onewalletcasino o  ON u.casino_id = o.casino_id
WHERE 
    game_start between dateadd(mi, -180, getdate()) 
                       and dateadd(mi, -5, getdate())  
    and
    b.[status] <> 'P'

EXCEPT
SELECT tp.casino_id, tp.game_id
FROM thirdpartysettlecalled   tp
WHERE tp.[status] = 'Y'

ORDER BY
    casino_id