SQL Server自定义函数(Table-valued Functions)

自定义函数(User-Defined Function)有两种，一种是标量UDF(Scalar-valued Functions)和表值UDF(Table-valued Functions)，前者只返回单个数据值，而后者则返回一个表。前面演示了标量自定义函数，http://www.cnblogs.com/insus/articles/1918983.html  ，现在下面两个实例均演示表值自定义函数，

代码

SET  ANSI_NULLS  ON
GO
SET  QUOTED_IDENTIFIER  ON
GO
CREATE   FUNCTION   [ dbo ] . [ udf_SuperUser ]
(
)
RETURNS   @SuperUser   TABLE ( [ Account ]   nvarchar ( 30 ), [ Password ]   nvarchar ( 30 ))
AS
BEGIN
     INSERT  SuperUser ( [ Account ] , [ Password ] )  VALUES ( ' Admin ' , ' mypassword@2010 ' );
     RETURN
END

  

另一个例子,

代码

SET  ANSI_NULLS  ON
GO
SET  QUOTED_IDENTIFIER  ON
GO
CREATE   FUNCTION   [ dbo ] . [ udf_Supervisor ]
(
)
RETURNS   TABLE  
AS
RETURN  
(
     SELECT   [ SupervisorId ] ,e. [ WorkNumber ] , [ EmployeeName ] ,w. [ WorkGroupId ] , [ WorkGroupName ] ,s. [ IsActive ]  
     FROM   [ Supervisor ]  s 
     LEFT   JOIN   [ Employee ]  e  ON  (s. [ WorkNumber ] = e. [ WorkNumber ] )
     LEFT   JOIN   [ WorkGroup ]  w  ON  (s. [ WorkGroupId ]   =  w. [ WorkGroupId ] )
)