[英]Can i copy data from one database table to another already existing database table sql server?
[英]Can I do left join from two table from one SQL Server database and one table from another database?
如有可能,有人可以给我看这个例子吗?
SELECT DISTINCT
S.SheetID,
IF.MOTHER,
IF.FATHER,
IF.SON,
IF.DAUGHTER,
FM.GRANDFATHER,
FM.GRANDMOTHER,
FM.UNCLE,
FM.AUNT
FROM
Family.dbo.family IF
LEFT JOIN
Family.dbo.fatherandmothersiderelatives FM ON S.SheetID = FM.FamilyID
LEFT JOIN
FammilyFiles.dbo.[Sheet] S ON S.SheetID = IF.FamilyID
是的,可以,但是您需要按引用的顺序连接表。 在您的示例Family.dbo.fatherandmothersiderelatives FM ON S.SheetID = FM.FamilyID
和别名之前引用Sheet s
(并且您将得到类似无法绑定多部分标识符“ S.SheetID”的错误。 )。 您需要更改顺序:
SELECT DISTINCT
S.SheetID,
[IF].MOTHER,
[IF].FATHER,
[IF].SON,
[IF].DAUGHTER,
FM.GRANDFATHER,
FM.GRANDMOTHER,
FM.UNCLE,
FM.AUNT
FROM
Family.dbo.family [IF]
LEFT JOIN
Family.dbo.[Sheet] S ON S.SheetID = [IF].FamilyID
LEFT JOIN
FamilyFiles.dbo.fatherandmothersiderelatives FM ON S.SheetID = FM.FamilyID
IF
也是一个保留关键字,因此对于表别名来说确实是一个糟糕的选择-如果您真的想使用它,可以将其括在上面的方括号中。
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