SQL Server date Query-sql query today, yesterday, 7 days, 30 days

Records reprinted from: Http://www.cnblogs.com/suruozhong/p/5974595.html

All data today: select * from table name where DateDiff (dd, datetime type field, getdate ()) = 0

All data from yesterday: select * from table name where DateDiff (dd, datetime type field, getdate ()) = 1

All data within 7 days: select * from table name where DateDiff (dd, datetime field, getdate ()) <= 7

All data within 30 days: select * from table name where DateDiff (dd, datetime type field, getdate ()) <= 30

All data for this month: select * from table name where DateDiff (mm, datetime type field, getdate ()) = 0

All data for this year: select * from table name where DateDiff (yy, datetime field, getdate ()) = 0

 

 

Query today is the day of the year: select datepart (dayofyear, getDate ())

Query today is the day of the month: 1. select datepart (dd, getDate ())

                        2.select day (getDate ())

Query the Monday date of this week (Note: The specified date cannot be Sunday. If it is Sunday, it will be calculated to the next Monday. So if it is Sunday, one day is subtracted.) getdate ()), 0)

 

Query yesterday's date: select convert (char, dateadd (DD, -1, getdate ()), 111) // 111 is the style number, (100-114)

 

Query the date of the first day of the month: Select DATEADD (mm, DATEDIFF (mm, 0, getdate ()), 0) as firstday

Query the date of the last day of the month: Select dateadd (ms, -3, DATEADD (mm, DATEDIFF (m, 0, getdate ()) + 1, 0)) as lastday // The value of -3 will change accordingly

 

How many days in the month: select datepart (dd, dateadd (dd, -1, dateadd (mm, 1, cast ((cast (year (getdate ()) as varchar) + '-' + cast (month (getdate () ) as varchar) + '-01') as datetime))))

 

Find the difference between the two time periods by a few days: select datediff (day, ‘2012/8/1’, ‘2012/8/20’) as daysum

± N days on the specified date: select convert (char, dateadd (dd, 1, ‘2012/8/20‘), 111) as riqi // output 2012/8/21

± N minutes on the specified date: select dateadd (mi, -15, getdate ()) // Query the date 15 minutes before the current time?

SQL Server date Query-sql query today, yesterday, 7 days, 30 days