更新SQL Server表與隨機名稱

Question

我嘗試以下操作：

update [Employees] set Last_User = 

(select top 1 name from 
(select 'John' as name 
union select 'Tim' as name 
union select 'Jane' as name 
union select 'Jack' as name 
union select 'Steve' as name 
union select 'Ann' as name 
) 

as names order by newid()) 

但保留所有行得到相同的名稱。我怎樣才能讓它變化？

注意：名稱是在查詢中輸入的，而不是來自其他表格。

感謝

Answer 1

您要更新整個列而不是更新的每一行，因此，這是如何產生更新爲所有行的第一個值，你可以通過使用T-SQL來完成預期的任務

DECLARE @counter int = 1 

WHILE @counter <= (SELECT COUNT(1) FROM [Employees]) --or any speific row set you want to modify 
BEGIN 

UPDATE a 
set Last_User = 
(SELECT top 1 name from 
(SELECT 'John' as name 
UNION SELECT 'Tim' AS name 
UNION SELECT 'Jane' AS name 
UNION SELECT 'Jack' AS name 
UNION SELECT 'Steve' AS name 
UNION SELECT 'Ann' AS name 
) 

AS names ORDER BY NEWID()) 
FROM (SELECT *,ROW_NUMBER() OVER (ORDER BY Last_User)rnum FROM [Employees])a 
WHERE a.rnum = @counter 

SET @counter = @counter + 1 

END 

Answer 2

你可以試試這個方法：

declare @Employees table (last_user nvarchar(100)) 
insert @Employees values('a') 
insert @Employees values('b') 
insert @Employees values('c') 

declare @temp table(name nvarchar(100)) 
insert into @temp values('John') 
insert into @temp values('Tim') 
insert into @temp values('Jane') 
insert into @temp values('Jack') 
insert into @temp values('Steve') 
insert into @temp values('Ann') 

update @Employees set Last_User = 

(select top 1 name from 
    @temp as names order by newid()) 

select * from @Employees