从存储过程中获取多个 SELECT 语句的结果答案

【问题标题】：Getting result of multiple SELECT statements from stored procedure从存储过程中获取多个 SELECT 语句的结果
【发布时间】：2013-06-19 18:07:07
【问题描述】：

我正在练习创建一个存储过程，其中包含多个 select 查询，我想将所有这些查询的结果作为一个数据集返回，以便我可以将它们放入一个数组中。

但是从我编写的存储过程来看，只返回第一个查询的结果，而不是其余的。

CREATE PROCEDURE getPost
AS
SET NOCOUNT ON
SELECT TOP 5 title,summary,cphoto,pId FROM [post] WHERE [status]=1 order by dtetme DESC;
SELECT TOP 1 title,summary,cphoto,pId FROM [post] WHERE [status]=1 order by dtetme DESC;
SELECT TOP 1 title,summary,cphoto,pId FROM [post] WHERE [status]=1 order by [hits] DESC;
SELECT TOP 5 title,summary,cphoto,pId FROM [post] WHERE [status]=1 AND category=(SELECT id FROM category where name='Small') order by dtetme DESC;
SELECT TOP 5 title,summary,cphoto,pId FROM [post] WHERE [status]=1 AND category=(SELECT id FROM category where name=’Medium’) order by dtetme DESC;
SELECT TOP 1 title,summary,cphoto,pId FROM [post] WHERE [status]=1 AND category=(SELECT id FROM category where name='Big’) order by dtetme DESC;
SELECT TOP 3 title,summary,cphoto,pId FROM [post] WHERE [status]=1 order by newid();
GO

我正在使用 MS SQL Server。请帮忙！

【问题讨论】：

标签： sql sql-server stored-procedures

【解决方案1】：

您可以在每个SELECT 之间放置一个UNION

CREATE PROCEDURE getPost
AS
SET NOCOUNT ON
SELECT TOP 5 title,summary,cphoto,pId FROM [post] WHERE [status]=1 order by dtetme     DESC
UNION
SELECT TOP 1 title,summary,cphoto,pId FROM [post] WHERE [status]=1 order by dtetme DESC
UNION
SELECT TOP 1 title,summary,cphoto,pId FROM [post] WHERE [status]=1 order by [hits] DESC
UNION
SELECT TOP 5 title,summary,cphoto,pId FROM [post] WHERE [status]=1 AND category=(SELECT id FROM category where name='Small') order by dtetme DESC
UNION
SELECT TOP 5 title,summary,cphoto,pId FROM [post] WHERE [status]=1 AND category=(SELECT id FROM category where name=’Medium’) order by dtetme DESC
UNION
SELECT TOP 1 title,summary,cphoto,pId FROM [post] WHERE [status]=1 AND category=(SELECT id FROM category where name='Big’) order by dtetme DESC
UNION
SELECT TOP 3 title,summary,cphoto,pId FROM [post] WHERE [status]=1 order by newid();
GO

请注意，如果您使用UNION，您将不会得到任何重复，并且您的查询在大型数据集上可能会变慢。如果你改用UNION ALL，你可能会得到重复，但查询会更快。

【讨论】：

【解决方案2】：

将它们结合在一起

SELECT TOP 5 title,summary,cphoto,pId FROM [post] WHERE [status]=1 
UNION ALL
SELECT TOP 1 title,summary,cphoto,pId FROM [post] WHERE [status]=1 
UNION ALL
...
order by title DESC;

【讨论】：