66.sql server 数据库直接计算时间差

时间 2019-11-12

标签 66.sql sql server 数据库直接计算时间差栏目 SQL 繁體版

原文原文链接

1. sql server 数据库直接计算时间差sql

-- 计算两个时间差结果是int类型数据库

SELECT DATEDIFF(YEAR,'2005-12-29','2008-12-30') AS DiffDate -- 年server

SELECT DATEDIFF(MONTH,'2005-12-29','2008-12-30') AS DiffDate -- 月 it

SELECT DATEDIFF(DAY,'2008-12-10','2008-12-30') AS DiffDate -- 日 select

SELECT DATEDIFF(HOUR,'2008-12-30 00:00:00','2008-12-30 10:20:00') AS DiffDate -- 小时 im

SELECT DATEDIFF(MI,'2008-12-30 00:00:00','2008-12-30 00:20:10') AS DiffDate -- 分钟数据

SELECT DATEDIFF(SECOND,'2008-12-30 00:00:00','2008-12-30 00:01:10') AS DiffDate -- 秒top

2.时间长短截取img

select top 5
       a.monitor_time as '本来时间格式',
       convert(varchar(23),a.monitor_time ,121) as '23位数据格式',
       convert(varchar(19),a.monitor_time ,121) as '19位数据格式',
       convert(varchar(16),a.monitor_time ,121) as '16位数据格式',
       convert(varchar(13),a.monitor_time ,121) as '13位数据格式',
       convert(varchar(10),a.monitor_time ,121) as '10位数据格式'
       from t_air_monitor_factor_rtdata a order by monitor_time desc时间

效果：

-- 默认的时间格式
select CONVERT(varchar(20),GETDATE()) as nowTime

-- 标准时间格式
select CONVERT(varchar(20),GETDATE(),121) as nowTime

-- 截取时间格式到日
select CONVERT(varchar(10),GETDATE(),121) as nowTime
-- 截取时间格式到小时
select CONVERT(varchar(13),GETDATE(),121) as nowTime

-- 截取时间格式到分钟
select CONVERT(varchar(16),GETDATE(),121) as nowTime

-- 截取时间格式到秒
select CONVERT(varchar(19),GETDATE(),121) as nowTime

-- 只须要小时分钟秒
select CONVERT(varchar(8),GETDATE(),114) as nowTime