C# 在SQL 2005中,如何组合返回两个结果的存储过程的结果?
嘿,我是一个新的存储过程,我有这样的过程C# 在SQL 2005中,如何组合返回两个结果的存储过程的结果?,c#,sql-server-2005,C#,Sql Server 2005,嘿,我是一个新的存储过程,我有这样的过程 ALTER procedure [dbo].[list_of_employee] ( @employee_id int ) as begin select *from project_employee_rel PE inner join employee_details E on E.employee_id=PE.employee_id inner join project_details P on P.project_id=PE.proje
ALTER procedure [dbo].[list_of_employee]
(
@employee_id int
)
as
begin
select *from project_employee_rel PE
inner join employee_details E on E.employee_id=PE.employee_id
inner join project_details P on P.project_id=PE.project_id
where PE.employee_id=@employee_id
select * from employee_details
where employee_id=@employee_id
end
它分别返回两个结果
我希望得到这样的结果:“若第一个查询返回空行或null,那个么第二个查询将执行,否则不会执行。”
请帮帮我
提前感谢试试这个
IF Check Count of your first query
return result set
ELSE
return other result set
END
ALTER procedure [dbo].[list_of_employee]
(
@employee_id int
)
as
BEGIN
DECLARE @Count int
SET @Count = select COUNT(PRIMARYKEY COLUMN) from project_employee_rel PE
inner join employee_details E on E.employee_id=PE.employee_id
inner join project_details P on P.project_id=PE.project_id
where PE.employee_id=@employee_id
IF (@Count>0)
BEGIN
select *from project_employee_rel PE
inner join employee_details E on E.employee_id=PE.employee_id
inner join project_details P on P.project_id=PE.project_id
where PE.employee_id=@employee_id
END
ELSE
BEGIN
select * from employee_details
where employee_id=@employee_id
END
END
这两个查询有不同的结果模式,您确定这是您想要的吗?如果您按照建议对代码进行分支,不同的
@employee\u id
将使用完全不同的查询计划,结果的结构将根据您提供的值而有所不同。。。SP将成为性能负担而不是性能优势。我不想降低sphey thank u的性能,这正是我想要的。为了提高sp性能,我还找到了另一个使用左外连接的解决方案。这很好,我只是给出了您想要的答案,如果它对您有帮助,请向上投票。