The year, month, and day of the T-SQL time

Data that is often stored in the datetime format of SQL Server is sometimes, minute, second, and so on. However, when the page is read, the notification only requires year, month, and day,

You can use the following method to read data from the system:

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1. Convert (varchar (12), time column name, 111)

 

For example, if the column operdate in table 1 is in the datetime format, you must read the year, month, and day of operdate.

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1. Select convert (varchar (12), operdate, 111) from Table1

 

 

-============================================== ============

-- Some tips for getting time in SQL
*****************
-- ===================================================== ============
Select dateadd (mm, datediff (mm, 0, getdate (), 0)

Select datediff (mm, 0, getdate ())

Select dateadd (wk, datediff (wk, 0, getdate (), 0)
Select dateadd (YY, datediff (YY, 0, getdate (), 0)
Select dateadd (QQ, datediff (QQ, 0, getdate (), 0)

-------------- Midnight --------------------------------------------
Select dateadd (DD, datediff (DD, 0, getdate (), 0)

-------------- Last day --------------------------------------------
Select dateadd (MS,-3, dateadd (mm, datediff (mm, 0, getdate (), 0 ))
Select dateadd (MS,-3, dateadd (YY, datediff (YY, 0, getdate (), 0 ))
Select dateadd (MS,-3, dateadd (mm, datediff (M, 0, getdate () + 1, 0 ))
Select dateadd (MS,-3, dateadd (YY, datediff (YY, 0, getdate () + 1, 0 ))

Select dateadd (wk, datediff (wk, 0, dateadd (DD, 6-datepart (day, getdate (), getdate (), 0)

---------- Remove the hour, minute, second ----------------------------
Declare @ A datetime
Set @ A = getdate ()
Select @ A, dateadd (day, datediff (day, 0, @ A), 0)

---------- Weekly notice ----------------------------
Select datename (weekday, getdate ())

---------- How to obtain the data of a certain month -------------------
Declare @ M int
Set @ M = 3 -- month
Select datediff (day, '2017-'+ Cast (@ M as varchar) +'-15', '2017-'+ Cast (@ m + 1 as varchar) + '-15 ')

---------- Or use the Statement on the last day of the month, and then use the day function to calculate the last day of the month.
Select Day (dateadd (MS,-3, dateadd (mm, datediff (M, 0, getdate () + 1, 0 )))

---------- Determine whether to renew the subscription for one year :------------------------
Select case day (dateadd (mm, 2, dateadd (MS,-3, dateadd (YY, datediff (YY, 0, getdate (), 0 )))) when 28 then 'Ping

'Else' begin year' end

Select case datediff (day, datename (year, getdate () + '-02-01', dateadd (mm, 1, datename (year, getdate () + '-02-

01 '))
When 28 then 'Year' else 'Year' end

---------- How many days a quarter ------------------------
Declare @ M tinyint, @ time smalldatetime
Select @ M = month (getdate ())
Select @ M = case when @ m between 1 and 3 then 1
When @ m between 4 and 6 then 4
When @ m between 7 and 9 then 7
Else 10 end
Select @ time = datename (year, getdate () + '-' + convert (varchar (10), @ M) + '-01'
Select datediff (day, @ time, dateadd (mm, 3, @ time ))

Select convert (varchar (8), dateadd (M, datediff (M, '', getdate (),''), 112) as [early month]
Select convert (varchar (8), dateadd (M,-3, getdate (), 112) as [three months ago]