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

All data for today: select * from table name where DateDiff (dd, datetime type field, getdate ()) = 0
All data of 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 type 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 type 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 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, it will be reduced by one day) SELECT DATEADD (wk, DATEDIFF (wk, 0, 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 // Modify the value of -3 will change accordingly
 
How many days are there in this 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 two time periods by several 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?

Original address: https://www.cnblogs.com/suruozhong/p/5974595.html

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