CREATE function [dbo].[f_testFunc](     @v_id nvarchar(4000)    ,@v_type nvarchar(4000) )    returns NVARCHAR(4000) asbegin    declare @str_res NVARCHAR(4000);    declare @str_id NVARCHAR(4000);    declare @str_code NVARCHAR(4000);    declare @str_name NVARCHAR(4000);    SELECT @str_id = a.id,@str_code = a.event_code,@str_name = a.event_name    FROM app_event a     WHERE a.id = @v_id;    IF(@v_type='id')      RETURN @str_id    IF(@v_type='code')      RETURN @str_code     IF(@v_type='name')      RETURN @str_name           return @str_name;endGO