插入從JOIN插入空值

需要從3個表中插入值到另一個表稱爲myTable。 myTable中的必填字段爲：插入從JOIN插入空值

[Id_student] int, 
[id_subjects] int 
[degrees] float 
[st_Name] nvarchar(30) 
[Id_Class] int 
[Id_Group] int 
[Class] nvarchar(15) 
[group] nvarchar(15))` ..

我在下面創建了存儲過程。但查看錶後，我發現只有傳遞的參數才被保存！即@Id_student , @id_subjects , @degrees。任何人都可以解釋這段代碼有什麼問題嗎？

CREATE storedprocedure mySp_myTable_insert 
     @Id_student int, 
     @id_subjects int, 
     @degrees  int 
as 

DECLARE @st_Name nvarchar(30) 
SELECT @st_Name = pst.st_Name FROM dbo.sudents AS pst where [email protected]_student ; 

INSERT [myTable] 
    (
     [Id_student], 
     [id_subjects], 
     [degrees], 
     [st_Name], 
     [Id_Class], 
     [Id_Group], 
     [Class], 
     [group] 
    ) 

    (select 
     @Id_student, 
     @id_subjects, 
     @degrees, 
     @st_Name 
     ,tc.Id_Class 
     ,tg.Id_Group 
     ,tc.Class 
     ,tg.group 
    from dbo.subjects sbj 
    inner join tGroup tg 
    inner join tClass tc 
     on tc.Id_Class=tg.Id_Class 
     on sbj.Id_Group =tg.Id_Group 
    where [email protected]_subjects)

來源

2012-05-01 Salahaldin

@Siva，你應該張貼此作爲一個答案， – Habib

@Siva'INTO'根據T-SQL規格可選：http://msdn.microsoft.com /en-us/library/ms174335.aspx – GolfWolf

@Siva，謝謝，但[Into]是可以在INSERT和目標表之間使用的可選關鍵字。請參閱[link]（http://msdn.microsoft.com/ en-us/library/aa933206（v = sql.80）.aspx） – Salahaldin

我想你應該放棄括號圍繞SELECT聲明和修復join的順序 - on關鍵字/條款。

試試這個版本：

CREATE storedprocedure mySp_myTable_insert 
     @Id_student int, 
     @id_subjects int, 
     @degrees  int 
as 

DECLARE @st_Name nvarchar(30) 
SELECT @st_Name = pst.st_Name FROM dbo.sudents AS pst where [email protected]_student ; 

INSERT [myTable] 
    (
     [Id_student], 
     [id_subjects], 
     [degrees], 
     [st_Name], 
     [Id_Class], 
     [Id_Group], 
     [Class], 
     [group] 
    ) 
select 
    @Id_student, 
    @id_subjects, 
    @degrees, 
    @st_Name 
    ,tc.Id_Class 
    ,tg.Id_Group 
    ,tc.Class 
    ,tg.group 
from dbo.subjects sbj 
inner join tGroup tg on sbj.Id_Group =tg.Id_Group 
inner join tClass tc on tc.Id_Class=tg.Id_Class 
where [email protected]_subjects 

GO

來源

2012-05-01 10:00:21 GolfWolf

我試過了，它不會變得與衆不同！ – Salahaldin

你可以試試只運行'select'嗎？它是否返回有效數據？ – GolfWolf

yes確實..但是字段（[st_Name]，[Id_Class]，[Id_Group]，Class，[group]）爲空。 – Salahaldin

插入從JOIN插入空值

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