如何從select語句的結果中爲變量賦值？

Question

SELECT TOP 1 [FirstName], [LastName] 
FROM [table] 

DECLARE @firstName VARCHAR(25) 

在我運行上面的查詢之後，我想將從查詢中返回的[FirstName]賦給@firstName。

我該怎麼做？

Answer 1

DECLARE @firstName VARCHAR(25) 

SELECT TOP 1 @firstName = [FirstName] FROM [table] 

Answer 2

像這樣：

DECLARE @firstName VARCHAR(25), @LastName VARCHAR(25) 

SELECT TOP 1 @firstName = [FirstName], @LastName = [LastName] 
FROM [table] 

Answer 3

使用SET的值從查詢分配：

DECLARE @firstName VARCHAR(25) 

SET @firstName = (SELECT TOP 1 [FirstName] FROM [table])