SQL 查询本周本月问题

PHP中文网 • 2025年2月22日 21:56:56 • 数据库 • 阅读 2

sql 查询本周本月问题 —求相差天数 select datediff(day,

sql 查询本周本月问题

—求相差天数
select   datediff(day,’2004-01-01′,getdate())

–1.一个月第一天的
SELECT   DATEADD(mm,   DATEDIFF(mm,0,getdate()),   0)

–2.本周的星期一
SELECT   DATEADD(wk,   DATEDIFF(wk,0,getdate()),   0)

select   dateadd(wk,datediff(wk,0,getdate()),6)

–3.一年的第一天
SELECT   DATEADD(yy,   DATEDIFF(yy,0,getdate()),   0)

–4.季度的第一天
SELECT   DATEADD(qq,   DATEDIFF(qq,0,getdate()),   0)

–5.当天的半夜
SELECT   DATEADD(dd,   DATEDIFF(dd,0,getdate()),   0)

–6.上个月的最后一天
SELECT   dateadd(ms,-3,DATEADD(mm,   DATEDIFF(mm,0,getdate()),   0))

–7.去年的最后一天
SELECT   dateadd(ms,-3,DATEADD(yy,   DATEDIFF(yy,0,getdate()),   0))

–8.本月的最后一天
SELECT   dateadd(ms,-3,DATEADD(mm,   DATEDIFF(m,0,getdate())+1,   0))

–9.本年的最后一天
SELECT   dateadd(ms,-3,DATEADD(yy,   DATEDIFF(yy,0,getdate())+1,   0))

–10.本月的第一个星期一
select   DATEADD(wk,
DATEDIFF(wk,0,dateadd(dd,6-datepart(day,getdate()),getdate())),   0)

–查询本周注册人数
select   count(*)   from   [user]
where   datediff(week,create_day-1,getdate())=0

–上周注册人数
select   count(*)   from   [user]
where   datediff(week,create_day-1,getdate())=1


–本月注册人数
select   count(*)   from   [user]
where   datediff(month,create_day,getdate())=0

–上月注册人数
select   count(*)   from   [user]
where   datediff(month,create_day,getdate())=1

–如果要效率,这样写查询

–查询本周注册人数
select   count(*)   from   [user]
where   create_day>=dateadd(day,2-datepart(weekday,getdate()),convert(varchar,getdate(),112))
and   create_day
–上周注册人数
select   count(*)   from   [user]
where   create_day>=dateadd(day,-5-datepart(weekday,getdate()),convert(varchar,getdate(),112))
and   create_day

–本月注册人数
select   count(*)   from   [user]
where   create_day>=dateadd(day,1-day(getdate()),convert(varchar,getdate(),112))
and   create_day
–上月注册人数
select   count(*)   from   [user]
where   create_day>=dateadd(month,-1,dateadd(day,1-day(getdate()),convert(varchar,getdate(),112)))
and   create_day
–本周
select   count(*)   from   User
where   datediff(dd,create_day,getdate())
–上周
select   count(*)   from   User
where   datediff(dd,create_day,(getdate()   –   datepart(dw,getdate())))
–本月
select   count(*)   from   User
where   datepart(mm,create_day)   =   datepart(mm,getdate())

–上月
select   count(*)   from   User
where   datepart(mm,create_day)   =   datepart(mm,getdate())   –   1

–本周
select   count(*)   from   [User]
where   datediff(dd,create_day,getdate())
–上周
select   count(*)   from   [User]
where   datediff(dd,create_day,(getdate()   –   datepart(dw,getdate())))
–本月
select   count(*)   from   [User]
where   datepart(mm,create_day)   =   datepart(mm,getdate())
–上月
select   count(*)   from   [User]
where   datepart(mm,create_day)   =   datepart(mm,getdate())   –   1
学习
month(create_day)=month(getdate())本月
month(create_day)=month(getdate())-1   上月

补充查询今日所有的
SELECT * from feedback WHERE (DATEDIFF(d,fedtime,GETDATE())=0) ORDER BY fedid DESC