[MySQL] DATE_FORMAT

https://dev.mysql.com/doc/refman/8.1/en/date-and-time-functions.html#function_date-format

MySQL :: MySQL 8.1 Reference Manual :: 12.7 Date and Time Functions

DATE_FORMAT(date, format)

date 값을 format 문자열에 맞는 형식으로 반환한다. 두 매개변수 중 하나라도 NULL이면 NULL을 반환한다.

%가 앞에 붙는 specifier를 사용한다.

 

Specifiers

Specifier	Descriptoin
%a	Abbreviated weekday name (Sun, ..., Sat)
%b	Abbreviated month name (Jan, ..., Dec)
%c	Month, numeric (0, ..., 12)
%D	Day of the month with English suffix (0th, 1st, 2nd, 3rd, ...)
%d	Day of the month, numeric (00, ..., 31)
%e	Day of the month, numeric (0, ..., 31)
%f	Microseconds (000000, ..., 999999)
%H	Hour (00, ..., 23)
%h	Hour (01, ..., 12)
%I (대문자 i)	Hour (01, ..., 12)
%i	Minutes, numeric (00, ..., 59)
%j	Day of year (001, ..., 366)
%k	Hour (0, ..., 23)
%l (소문자 L)	Hour (1, ..., 12)
%M	Month name (January, ..., December)
%m	Month, numeric (00, ..., 12)
%p	AM or PM
%r	Time, 12-hour (hh:mm:ss followed by AM or PM)
%S	Seconds (00, ..., 59)
%s	Seconds (00, ..., 59)
%T	Time, 24-hour (hh:mm:ss)
%U	Week (00..53), where Sunday is the first day of the week; WEEK() mode 0
%u	Week (00..53), where Monday is the first day of the week; WEEK() mode 1
%V	Week (01..53), where Sunday is the first day of the week; WEEK() mode 2; used with %X
%v	Week (01..53), where Monday is the first day of the week; WEEK() mode 3; used with %x
%W	Weekday name (Sunday..Saturday)
%w	Day of the week (0=Sunday..6=Saturday)
%X	Year for the week where Sunday is the first day of the week, numeric, four digits; used with %V
%x	Year for the week, where Monday is the first day of the week, numeric, four digits; used with %v
%Y	Year, numeric, four digits
%y	Year, numeric (two digits)
%%	A literal % character
%x	x, for any "x" not listed above

%c, %d와 같이 0을 지원하는 이유는 MySQL이 '2014-00-00'과 같이 불완전한 날짜도 저장이 되기 때문이다.