Sql常用sql语句收藏夹

***https://www.tuicool.com/articles/eyIB7z***

***https://docs.microsoft.com/zh-cn/sql/relational-databases/system-dynamic-management-views/system-dynamic-management-views?view=sql-server-2017***

1.查看数据库连接数据

SHOW PROCESSLIST

2.查看当前数据库版本

# 查询当前数据库版本
select @@VERSION

3.返回不是时间类型的数据：isdate

select csj, ISDATE(csj) from dbo.t_gh where ISDATE(csj) = 0 order by csj asc;

4.查找两条相同的收费信息记录：

 --1:
 select count(*),id from receipt group by id having count(*)>1;
 --2:
 select *,ROW_NUMBER() over(partition by [Message] order by [Message] ASC) as rnk from [dbo].[Log]

5.根据所有分院查询各院的患者数量：

select distinct s.建档门诊,COUNT(s.病人编号) as 病人总数量
from dbo.病人基本信息 AS s
group by s.建档门诊

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