Question

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，以便将它们放入数组中。

但是根据我的编写，我的存储过程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。请帮助！

Answer 1

将他们联合起来

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;

Answer 2

您可以在每个UNION

之间放置SELECT

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，则不会获得任何重复项，并且您的查询在大型数据集上可能会变慢。如果您使用UNION ALL代替，则可能会出现重复项，但查询速度会更快。

从存储过程中获取多个SELECT语句的结果

2 个答案: