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Add minute, hour, day, month in date in sql server

--By using DATEADD(<interval>,<increment int>,<expression smalldatetime>) function we can add or reduce hour, day etc..
--For increment or decrement from the datetime the query are given below.
--For add minute  
DATEADD(MINUTE,20,GETDATE())
--For reduce minute 
DATEADD(MINUTE,-20,GETDATE())
--For add hour
DATEADD(HOUR,20,GETDATE())
--For reduce hour
DATEADD(HOUR,-20,GETDATE())
--For add day 
DATEADD(DAY,20,GETDATE())
--For reduce day  
DATEADD(DAY,-20,GETDATE())
--For add month   
DATEADD(MONTH,20,GETDATE())
--For reduce month
DATEADD(MONTH,-20,GETDATE())
--For add year   
DATEADD(YEAR,20,GETDATE())
--For reduce year 
DATEADD(YEAR,-20,GETDATE())