Question

为什么这是错的，我该怎么说呢？

SELECT     PublicationID
FROM         (SELECT DISTINCT pat.PublicationID
                       FROM          dbo.PubAdvTransData AS pat INNER JOIN
                                          dbo.PubAdvertiser AS pa ON pat.AdvTransID =   pa.AdvTransID
                       WHERE      (pat.LastAdDate > '7 / 1 / 2009') AND (pat.PublicationID = 29171)) AS table1
UNION
SELECT     PublicationAreaBuy.AreaBuyID AS PublicationID
FROM         PublicationAreaBuy INNER JOIN
                      table1 AS table1_1 ON table1.publicationID =     PublicationAreaBuy.PublicationID

错误是table1是无效对象。

感谢。

Answer 1

您有一个范围问题。联合组合了两个单独的查询。因此，如果您将查询分开：

SELECT PublicationID
FROM ( SELECT DISTINCT pat.PublicationID
       FROM dbo.PubAdvTransData AS pat 
       INNER JOIN dbo.PubAdvertiser AS pa 
         ON pat.AdvTransID =   pa.AdvTransID
       WHERE (pat.LastAdDate > '7 / 1 / 2009') AND (pat.PublicationID = 29171)
     ) AS table1



SELECT PublicationAreaBuy.AreaBuyID AS PublicationID
FROM PublicationAreaBuy 
INNER JOIN table1 AS table1_1 
  ON table1.publicationID = PublicationAreaBuy.PublicationID

你可以看到在第二个查询中没有table1这样的东西。还有其他一些方法可以实现您的目标：

复制子查询（丑陋）
使用公用表表达式（仅当这是T-SQL时）
使用#temporary @table（再次，我只知道如何在T-SQL中执行此操作）

如果我们要复制子查询，它看起来像这样。但是，顶部查询没有条件，因此它不需要是子查询：

SELECT DISTINCT pat.PublicationID
FROM dbo.PubAdvTransData AS pat 
INNER JOIN dbo.PubAdvertiser AS pa 
   ON pat.AdvTransID =   pa.AdvTransID
WHERE (pat.LastAdDate > '7 / 1 / 2009') AND (pat.PublicationID = 29171)


UNION

SELECT PublicationAreaBuy.AreaBuyID AS PublicationID
FROM PublicationAreaBuy 
INNER JOIN ( SELECT DISTINCT pat.PublicationID
       FROM dbo.PubAdvTransData AS pat 
       INNER JOIN dbo.PubAdvertiser AS pa 
         ON pat.AdvTransID =   pa.AdvTransID
       WHERE (pat.LastAdDate > '7 / 1 / 2009') AND (pat.PublicationID = 29171)
     ) AS table1 
  ON table1.publicationID = PublicationAreaBuy.PublicationID

Answer 2

嗯..是的。

两个select语句彼此不同，即使结果由union联合在一起。

您使用的是什么SQL服务器，包括版本？

Answer 3

AFAIK，你不能引用另一个查询。你要联合在一起的两个查询必须是分开的和不同的。

当你考虑这个时，它是有道理的，因为所有联盟真正做的是将两个查询的输出连续拼接在一起。

Answer 4

你可以使用临时表，但我觉得可能有一个更好的方法。在不知道您的数据库架构或您想要实现的目标的情况下，很难推荐其他任何内容。

CREATE TABLE #temp
(
    PublicationID int
)

SELECT DISTINCT INTO #temp pat.PublicationID
                  FROM dbo.PubAdvTransData AS pat 
                  INNER JOIN dbo.PubAdvertiser AS pa ON pat.AdvTransID = pa.AdvTransID
                  WHERE (pat.LastAdDate > '7 / 1 / 2009') AND (pat.PublicationID = 29171)

    SELECT PublicationID
    FROM   #temp
    UNION
    SELECT PublicationAreaBuy.AreaBuyID AS PublicationID
    FROM   PublicationAreaBuy 
    INNER JOIN #temp As Table1 ON Table1.PublicationID = PublicationAreaBuy.PublicationID

免责声明：我手动输入，请在运行前检查语法错误。

Answer 5

尝试使用CTE代替您的第一个查询

WITH MyCTE AS 
(
    SELECT DISTINCT pat.PublicationID
    FROM   dbo.PubAdvTransData AS pat 
        INNER JOIN dbo.PubAdvertiser AS pa ON pat.AdvTransID = pa.AdvTransID
    WHERE (pat.LastAdDate > '7 / 1 / 2009') AND (pat.PublicationID = 29171)
)
SELECT PublicationAreaBuy.AreaBuyID AS PublicationID
FROM   PublicationAreaBuy 
    INNER JOIN MyCTE ON MyCTE.publicationID = PublicationAreaBuy.PublicationID

UNION SQL语句不起作用

5 个答案: