【SQL】Time function

First day of the year:
DATE_SUB(CURDATE(),INTERVAL dayofyear(now())-1 DAY)

First day of last month:
DATE_SUB(DATE_SUB(CURDATE(),INTERVAL EXTRACT(DAY FROM CURDATE()) - 1 DAY),INTERVAL 1 MONTH)

Last day of last month:
DATE_SUB(DATE_SUB(CURDATE(),interval EXTRACT(DAY FROM CURDATE()) DAY),INTERVAL 0 MONTH)

First day of the month:
DATE_ADD(CURDATE(), INTERVAL - DAY(CURDATE()) + 1 DAY)

Current date:
CURDATE()

Last day of the month:
DATE_SUB(date_sub(CURDATE(),INTERVAL EXTRACT(DAY FROM CURDATE()) DAY),INTERVAL -1 MONTH)

Last 30 days:
BETWEEN DATE_SUB(CURDATE(), INTERVAL 30 DAY) AND CURDATE()

 
 
 
To be continued…