Question

我有两张桌子。客户（clientid，公司，州，地位）和supportstatus（clientid，公司，地位，协议）。以下查询是否应该返回协议值为0且状态不等于“已禁用”的所有公司？我很困惑，因为我正在选择公司，我正在加入，两个表由公共因子（clientid），我正在过滤查询的结果。

SELECT cl.company
FROM   clients cl
       INNER JOIN supportstatus su
         ON cl.clientid = su.clientid
WHERE  su.agreement11 = 0
       AND su.status <> 'disabled'
ORDER  BY cl.company

ColdFusion来源

<cfquery name="qryPendingAgreement" datasource="support">
SELECT clientid
FROM supportstatus
WHERE agreement11 = 0 AND status <> 'disabled'
</cfquery>

<cfquery name="qryClient" datasource="support">
SELECT     clientid, company, state, serv_billing
FROM         clients
WHERE prod_arth = 1 OR prod_artr = 1 OR prod_epcr_host = 1 OR prod_epcr_remote = 1 OR prod_billing = 1 OR prod_collections = 1
</cfquery>

<cfquery name="qryResults" dbtype="query">
SELECT qryClient.company, qryClient.state, qryClient.serv_billing
FROM qryPendingAgreement, qryClient
WHERE qryPendingAgreement.clientid = qryClient.clientid
order by qryClient.company
</cfquery>

Answer 1

您没有说明查询给您的结果。如果查询过滤的行数超出您的预期，那么答案可能是三值逻辑。

null != 'disabled' - ＆gt; null，这不是真的，行会被过滤。

请尝试使用此过滤器。

WHERE  su.agreement11 = 0
    AND isnull(su.status,'') <> 'disabled'

Answer 2

这可以帮助您测试查询。你的问题不够具体，所以，这是我能做的最好的事情：）

    DECLARE @client TABLE
    (
      clientid int,
      company VARCHAR(50)
    )
    DECLARE @supportstatus TABLE
    (
      clientid int,
      [status] VARCHAR(50),
      agreement INT
    )

    INSERT INTO @client ([clientid],[company]) VALUES ( 0,'acme' ) 
    INSERT INTO @client ([clientid],[company]) VALUES ( 1,'byron' ) 
    INSERT INTO @client ([clientid],[company]) VALUES ( 2,'cathode' ) 

    INSERT INTO @supportstatus ([clientid],[status], agreement) VALUES ( 0, 'disabled',0)
    INSERT INTO @supportstatus ([clientid],[status], agreement) VALUES ( 0, 'disabled',1)
    INSERT INTO @supportstatus ([clientid],[status], agreement) VALUES ( 0, 'somethingelse',0)
    INSERT INTO @supportstatus ([clientid],[status], agreement) VALUES ( 0, 'somethingelse',1)

    INSERT INTO @supportstatus ([clientid],[status], agreement) VALUES ( 1, 'disabled',0)
    INSERT INTO @supportstatus ([clientid],[status], agreement) VALUES ( 1, 'disabled',1)
    --INSERT INTO @supportstatus ([clientid],[status], agreement) VALUES ( 1,   'somethingelse',0)
    --INSERT INTO @supportstatus ([clientid],[status], agreement) VALUES ( 1,   'somethingelse',1)

    --INSERT INTO @supportstatus ([clientid],[status], agreement) VALUES ( 2,   'disabled',0)
    INSERT INTO @supportstatus ([clientid],[status], agreement) VALUES ( 2, 'disabled',1)
    --INSERT INTO @supportstatus ([clientid],[status], agreement) VALUES ( 2,   'somethingelse',0)
    INSERT INTO @supportstatus ([clientid],[status], agreement) VALUES ( 2, 'somethingelse',1)

    -- all companies who have su.agreement = 0 and su.status <> 'disabled' 
    SELECT cl.company 
    FROM @client cl 
    JOIN @supportstatus su ON cl.clientid = su.clientid 
    WHERE su.agreement = 0 AND su.status <> 'disabled' 
    Order By cl.company

Answer 3

这是一个疯狂的猜测，但如果您使用的是此版本：

SELECT cl.company
FROM   clients cl
       INNER JOIN supportstatus su
         ON cl.clientid = su.clientid
WHERE  su.agreement11 = 0
       AND su.status <> 'disabled'
       OR prod_arth = 1      OR prod_artr = 1 
       OR prod_epcr_host = 1 OR prod_epcr_remote = 1 
       OR prod_billing = 1   OR prod_collections = 1
ORDER  BY cl.company

问题是AND，OR优先级。试试这个：

SELECT cl.company
FROM   clients cl
       INNER JOIN supportstatus su
         ON cl.clientid = su.clientid
WHERE  su.agreement11 = 0
       AND su.status <> 'disabled'
       AND ( prod_arth = 1      OR prod_artr = 1 
          OR prod_epcr_host = 1 OR prod_epcr_remote = 1 
          OR prod_billing = 1   OR prod_collections = 1
           )
ORDER  BY cl.company

SQL连接问题澄清

3 个答案: