Oracle TRUNC function processing date format

GPS platform 、 Website construction 、 software development 、 The system operational , Find Senda network technology ！

​ ​https://cnsendnet.taobao.com​​

From the official blog of Sunda Technology

​ ​http://www.cnsendblog.com/index.php/?p=2204​​

Log in and copy

      
      

       
        Another explanation , After interception, the result is still date data type 
      
      
      
      

       
       
1.
      
      

select
to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') from dual;  -- Display current time
2011-12-29 16:24:34

select
trunc(sysdate,'year') from dual; -- Cut to year （ The first day of the year ）
2011-1-1

select
trunc(sysdate,'q') from dual; -- Intercept to quarter （ The first day of the quarter ）
2011-10-1

select
trunc(sysdate,'month') from dual; -- Intercept to month （ The first day of the month ）
2011-12-1

select trunc(sysdate,'')
from dual; 
empty

select
to_char(trunc(sysdate),'yyyymmdd hh24:mi:ss') from dual; -- The default interception date is （ Zero minute and zero second of the day ）
20111229 00:00:00

trunc(sysdate)  This is the intercept date section , When you need to use dates for grouping , You can use this function , As shown below   edit by sand

select trunc(sysdate-1,'w') from dual;  -- The Thursday closest to the current time , If the current day is Thursday, return to the current day , Otherwise, return to last Thursday 2011-12-22

select
trunc(sysdate,'ww') from dual;  -- Intercepted last weekend （ Last Saturday ）2011-12-24

select
trunc(sysdate,'day') from dual; -- Intercept to week （ First day of the week , Last Sunday ）2011-12-25

select
trunc(sysdate,'iw') from dual; -- This week 2 God , This Monday 2011-12-26

select
to_char(trunc(sysdate,'dd'),'yyyymmdd hh24:mi:ss') from dual;-- Intercept to day （ Zero minute and zero second of the day ）20111229 00:00:00

select
trunc(sysdate,'hh24') from dual;  -- Intercept to hours （ Current hour , Zero minute zero second ）2011-12-29 16:00:00

select
trunc(sysdate,'mi') from dual; -- Intercept points （ The current points , Zero seconds ）2011-12-29 16:24:00

select
trunc(sysdate,'ss') from dual ;-- Report errors , There is no format accurate to seconds

GPS platform 、 Website construction 、 software development 、 The system operational , Find Senda network technology ！

​ ​https://cnsendnet.taobao.com​​

From the official blog of Sunda Technology

​ ​http://www.cnsendblog.com/index.php/?p=2204​​