Question

SQL Server中set和select之间有什么区别，因为这两个关键字都用于在Microsoft SQL Server中分配参数值？

Answer 1

SET用于分配单个值，而SELECT用于分配多个值。例如

DECLARE @Product TABLE (ProductId INT,ProductCode VARCHAR(10), Name VARCHAR(100))
INSERT INTO @Product(ProductId,ProductCode,Name) 
(SELECT 1,'P001','Computer')

DECLARE @variable1 INT,@variable2 AS VARCHAR(100),@variable3 AS VARCHAR(100)
SET @variable1 = (SELECT ProductId FROM @Product)

SELECT @variable2 =  ProductCode, @variable3 = Name FROM @Product
SELECT @variable1,@variable2,@variable3

SQL Server中set和select之间的区别

1 个答案: