网上摘下的数据库例子

网上摘下的数据库例子:

数据表A(栏目信息)

menuID(栏目ID,int)   addAdminID(填加者,varchar(20))   modifyAdminID(修改者,varchar(20)
        1                      1                               2
        2                      1                               3
        3                      2                               1
        4                      2
        5                      3

数据表B(管理员信息)

adminID(管理员ID,int)    adminName(管理员姓名,varchar(50))
       1                           张三
       2                           李四
       3                           王五


我想出现建立这样的视图:

menuID(栏目ID)     addAdminName(填加者)      modifyAdminName(修改者)
      1                    张三                    李四
      2                    张三                    王五
      3                    李四                    张三
      4                    李四
      5                    王五


请各位给我思路或者SQL语句都可以,谢谢!

--創建測試環境
Create Table A
(menuID int,
 addAdminID varchar(20),
 modifyAdminID varchar(20))
Insert A Select         1,                      '1',                               '2'
Union All Select         2,                      '1',                               '3'
Union All Select         3,                      '2',                               '1'
Union All Select         4,                      '2',                               ''
Union All Select         5,                      '3',                               ''

Create Table B
(adminID int,
 adminName Nvarchar(50))
Insert B Select        1,                           N'张三'
Union All Select        2,                           N'李四'
Union All Select        3,                           N'王五'
GO
--創建視圖
Create View V_TEST
AS
Select
A.menuID,
B.adminName As addAdminName,
C.adminName As modifyAdminName
From
A
Left Join
B
On A.addAdminID = B.adminID
Left Join
B C
On A.modifyAdminID = C.adminID
GO
--測試
Select * From V_TEST
GO
--刪除測試環境
Drop Table A, B
Drop View V_TEST
GO
--結果
/*
menuIDaddAdminNamemodifyAdminName
1张三李四
2张三王五
3李四张三
4李四NULL
5王五NULL 

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转载自blog.csdn.net/rushcome/article/details/1662314
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