使用連接連接兩個或多個表

Question

我有兩種類型的表組織和OrgLogin。

組織：

ID 
Name 

OrgLogin：

LoginId 
UserName 
Password 

我想和組織中的表的用戶名和密碼選擇查詢。所以我使用了聯接。

我的查詢，

select top(55)'Insert into Organizations(Id,Username,Password,Name)values(' + 
     Cast(o.organizationId as varchar(50))+',''' + 
     IsNull(''''+ol.UserName+'''', 'NULL')+','+ 
     isnull(convert(nvarchar(max),HASHBYTES('MD5',ol.Password),1),'NULL')+ ')' 
    FROM Organization AS o 
    left join OrgLogin As ol ON ol.LoginId=o.OrganizationID 

我有以下結果集，

Insert into Organizations(Id,CreateDate,Username,Password)values(1,'NULL,NULL) 

Insert into Organizations(Id,CreateDate,Username,Password)values(2,'NULL,NULL) 

Insert into Organizations(Id,CreateDate,Username,Password)values(3,'NULL,NULL) 

Insert into Organizations(Id,CreateDate,Username,Password)values(4,'NULL,NULL) 

Insert into Organizations(Id,CreateDate,Username,Password)values(5,''V EX Electronics Systems Pvt.Ltd.Chennai',0xACB3BB721E1EC47C4CB569331ACC4E8E) 

Insert into Organizations(Id,CreateDate,Username,Password)values(5,''V EX Electronics Systems Pvt.Ltd.Chennai',0xACB3BB721E1EC47C4CB569331ACC4E8E) 

ID是重複看到 '5' 標識。兩次創建。爲什麼它發生？任何想法？

Answer 1

你應該整理一下單引號（第一ISNULL之前）

select top(55)' 
    Insert into Organizations(Id,Username,Password,Name)values(' + 
    Cast(o.organizationId as varchar(50))+',' + 
    IsNull(''''+ol.UserName+'''', 'NULL')+','+ 
    isnull(convert(nvarchar(max),HASHBYTES('MD5',ol.Password),1),'NULL')+ ')' 
FROM Organization AS o 
left join OrgLogin As ol ON ol.LoginId=o.OrganizationID 

接下來，o.id會重複每當有該組織多個OrgLogin記錄。