Question

我已经在数据库中创建了一些表，我想通过从所有这些表中选择列来创建单个视图。

这是我的查询：

CREATE VIEW dbo.View_Name
AS
    SELECT a.column1, a.column2, b.column1, b.column2, c.column1, c.column2
    FROM
        table1 AS a LEFT OUTER JOIN
        table2 AS b ON a.column1 = b.column1 LEFT OUTER JOIN
        table3 AS c ON b.column2 = c.column2
    WHERE   
    (a.[Load_Date] = (select max(Load_Date)
        From table1)

        and (b.[Load_Date] = (select max(Load_Date)
        From table2)

        and (c.[Load_Date] = (select max(Load_Date)
        From table3)

go

当我尝试使用多个where子句并完成查询时，它向我抛出错误“'go'附近的语句不正确”。

我是SQL Server的新手，我被困在这里。谁能帮我完成查询而没有错误？

Answer 1

您在WHERE中的括号混乱了-试试这个

CREATE VIEW dbo.View_Name

AS

SELECT a.column1, a.column2, b.column1, b.column2, c.column1, c.column2

FROM
table1 AS a LEFT OUTER JOIN

table2 AS b ON a.column1 = b.column1 LEFT OUTER JOIN

table3 AS c ON b.column2 = c.column2

WHERE
(a.[Load_Date] = (select max(Load_Date) From table1))

and (b.[Load_Date] = (select max(Load_Date) From table2))

and (c.[Load_Date] = (select max(Load_Date) From table3))

go

Answer 2

您可以重写您的内容，如下所示：

WITH T1 AS
    (SELECT TOP 1 WITH TIES
            Column1,
            Column2
     FROM Table1
     ORDER BY Load_Date DESC),
T2 AS
    (SELECT TOP 1 WITH TIES
            Column1,
            Column2
     FROM Table2
     ORDER BY Load_Date DESC),
T3 AS
    (SELECT TOP 1 WITH TIES
            Column1,
            Column2
     FROM Table3
     ORDER BY Load_Date DESC)
SELECT *
FROM T1
     JOIN T2 ON T1.Column1 = T2.Column1
     JOIN T3 ON T2.Column1 = T2.Column2;

请注意，在您引用JOIN中来自LEFT JOIN的对象时，我使用了WHERE，使它们隐含了INNER JOIN。

如何在SQL Server Management Studio中使用其中的不同where子句语句创建视图？

2 个答案: