SQL Server-查询帮助

我有以下表格：

媒体

活动使用媒体，属于池

CampaignID   MediaID   PoolID
----------------------------
1            100       1
2            100       2
3            200       1

竞选资金池

给定传递给查询的特定活动ID和池ID，我希望下面的select查询确定媒体是否属于传递的活动和/或池

SELECT m.* 
FROM media m
<!--- whatever required joins --->

---

我希望这是有意义的。

您可以这样做：

select m.MediaID, m.MediaTypeID, m.mediaTitle as Title, c.CampaignID as BelongsToCampaign,     cp.PoolID as belongsToPool
from campaings c, media m,  campaign_pools cp
where (m.mediaid = c.mediaid) and (c.poolId = cp.poolId) and 
(c.campaignID = [your variable] or cp.PoolId = [your other variable])

Select MediaID,MediaTypeID,Title,ISNULL(c.CampaignID,0) as  BelongsToCampaign,ISNULL(p.PoolID,0) as  BelongsToPool
From Media m
LEFT OUTER JOIN Campaign c on m.MediaID=c.MediaID
LEFT OUTER JOIN Pools p on p.PoolID=c.PoolID
where c.CampaignID=@CampaignID OR p.PoolID=@PoolID

---

关于

根据您的规范，我不确定您是否希望结果集按照@BizApps的回答返回所有媒体或仅返回某些子集-在此处发布两行以上的样本数据可能会有所帮助

以下联合包含四个可能的子集：删除或注释掉不需要的子集。我相信您可以看到CTE可用于减少代码重复的地方：

SELECT m.*, t.BelongsToCampaign, t.BelongsToPool
  FROM (
        -- Campaign INTERSECT Pool
        SELECT c.MediaID, 1 AS BelongsToCampaign, 1 AS BelongsToPool
          FROM CAMPAIGNS AS c
         WHERE c.CampaignID = @CampaignID
        INTERSECT 
        SELECT MediaID, 1, 1
          FROM CAMPAIGN_POOLS AS p JOIN CAMPAIGNS AS c ON p.PoolID = c.PoolID
         WHERE p.PoolID = @PoolID

        -- Campaign EXCEPT Pool
        UNION
        SELECT c.MediaID, 1, 0
          FROM CAMPAIGNS AS c
         WHERE c.CampaignID = @CampaignID
        EXCEPT 
        SELECT MediaID, 1, 0
          FROM CAMPAIGN_POOLS AS p JOIN CAMPAIGNS AS c ON p.PoolID = c.PoolID
         WHERE p.PoolID = @PoolID

        -- Pool EXCEPT Campaign
        UNION
        SELECT MediaID, 0, 1
          FROM CAMPAIGN_POOLS AS p JOIN CAMPAIGNS AS c ON p.PoolID = c.PoolID
         WHERE p.PoolID = @PoolID
        EXCEPT 
        SELECT c.MediaID, 0, 1
          FROM CAMPAIGNS AS c
         WHERE c.CampaignID = @CampaignID

        -- Media in neither Pool nor Campaign
        UNION
        SELECT m.MediaID, 0, 0
          FROM MEDIA AS m
        EXCEPT 
        SELECT c.MediaID, 0, 1
          FROM CAMPAIGNS AS c
         WHERE c.CampaignID = @CampaignID
        EXCEPT 
        SELECT MediaID, 1, 0
          FROM CAMPAIGN_POOLS AS p JOIN CAMPAIGNS AS c ON p.PoolID = c.PoolID             
         WHERE p.PoolID = @PoolID
       ) AS t 
       JOIN MEDIA AS m ON m.MediaID = t.MediaID;

---

这不是标准的tsql语法。我认为在不指定连接类型的情况下，逗号默认为内部连接，这不符合他的要求。此外，我认为他希望0代表空值，所以在select部分需要一个isnull语句。。。连接语法-这是传统的，如果您碰巧忘记了连接条件，这是很危险的，因为在WHERE子句中，连接条件和实际WHERE条件都混合在一起，这很混乱-使用ANSI连接语法内部连接，而不是左外部连接！

select m.MediaID, m.MediaTypeID, m.mediaTitle as Title, c.CampaignID as BelongsToCampaign,     cp.PoolID as belongsToPool
from campaings c, media m,  campaign_pools cp
where (m.mediaid = c.mediaid) and (c.poolId = cp.poolId) and 
(c.campaignID = [your variable] or cp.PoolId = [your other variable])

Select MediaID,MediaTypeID,Title,ISNULL(c.CampaignID,0) as  BelongsToCampaign,ISNULL(p.PoolID,0) as  BelongsToPool
From Media m
LEFT OUTER JOIN Campaign c on m.MediaID=c.MediaID
LEFT OUTER JOIN Pools p on p.PoolID=c.PoolID
where c.CampaignID=@CampaignID OR p.PoolID=@PoolID

SELECT m.*, t.BelongsToCampaign, t.BelongsToPool
  FROM (
        -- Campaign INTERSECT Pool
        SELECT c.MediaID, 1 AS BelongsToCampaign, 1 AS BelongsToPool
          FROM CAMPAIGNS AS c
         WHERE c.CampaignID = @CampaignID
        INTERSECT 
        SELECT MediaID, 1, 1
          FROM CAMPAIGN_POOLS AS p JOIN CAMPAIGNS AS c ON p.PoolID = c.PoolID
         WHERE p.PoolID = @PoolID

        -- Campaign EXCEPT Pool
        UNION
        SELECT c.MediaID, 1, 0
          FROM CAMPAIGNS AS c
         WHERE c.CampaignID = @CampaignID
        EXCEPT 
        SELECT MediaID, 1, 0
          FROM CAMPAIGN_POOLS AS p JOIN CAMPAIGNS AS c ON p.PoolID = c.PoolID
         WHERE p.PoolID = @PoolID

        -- Pool EXCEPT Campaign
        UNION
        SELECT MediaID, 0, 1
          FROM CAMPAIGN_POOLS AS p JOIN CAMPAIGNS AS c ON p.PoolID = c.PoolID
         WHERE p.PoolID = @PoolID
        EXCEPT 
        SELECT c.MediaID, 0, 1
          FROM CAMPAIGNS AS c
         WHERE c.CampaignID = @CampaignID

        -- Media in neither Pool nor Campaign
        UNION
        SELECT m.MediaID, 0, 0
          FROM MEDIA AS m
        EXCEPT 
        SELECT c.MediaID, 0, 1
          FROM CAMPAIGNS AS c
         WHERE c.CampaignID = @CampaignID
        EXCEPT 
        SELECT MediaID, 1, 0
          FROM CAMPAIGN_POOLS AS p JOIN CAMPAIGNS AS c ON p.PoolID = c.PoolID             
         WHERE p.PoolID = @PoolID
       ) AS t 
       JOIN MEDIA AS m ON m.MediaID = t.MediaID;