我有一个学生表,包含以下参数:
[ID] [nvarchar](50) NOT NULL,
[Firsname] [nvarchar](50) NOT NULL,
[Lastname] [nvarchar](50) NOT NULL,
[Melicode] [nchar](10) NOT NULL,
[City] [nvarchar](50) NOT NULL,
[Province] [nvarchar](50) NOT NULL,
[Active] [int] NULL
我想编写一个名为Show的表值函数,它有一个数字参数。函数将按以下方式运行:
- 如果@number = 1,则返回从Student表中的所有列
- 如果@number = 2,则仅返回Student表中的City列
- 如果@number = 3,则仅返回Student表中的Province列
Create function Show(@number int)
RETURNS @result TABLE
(
[ID] [nvarchar](50) NOT NULL,
[Firsname] [nvarchar](50) NOT NULL,
[Lastname] [nvarchar](50) NOT NULL,
[Melicode] [nchar](10) NOT NULL,
[City] [nvarchar](50) NOT NULL,
[Province] [nvarchar](50) NOT NULL,
[Active] [int] NULL
)
AS
BEGIN
IF (@number = 1)
INSERT INTO @result SELECT * from Student
IF (@number = 2)
INSERT INTO @result (City) values ((SELECT City from Student))
IF (@number = 3)
INSERT INTO @result (Province) values ((SELECT Province from Student))
RETURN -- @Players (variable only required for Scalar functions)
END
go
select *from dbo.show(1)