mysql query statistics grouped by date

Recently wrote a user interface to the relevant statistics, statistics are grouped according to the need to use every day.

Look directly statement

SELECT DATE_FORMAT( create_time, "%Y-%m-%d" ) ,sum(user_id) FROM orders WHERE order_state=2 GROUP BY DATE_FORMAT( create_time, "%Y-%m-%d" ) ;
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DATE_FORMAT Function Description

• grammar

DATE_FORMAT(date,format)

//上面代码中使用的是
DATE_FORMAT( create_time, "%Y-%m-%d" )
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The date argument is legitimate date. format output format predetermined date / time.

• Format format that can be used

format	description
%a	Abbreviated weekday name
%b	Abbreviated month name
%c	Month, the value
%D	Mid-day with the English prefix
%d	Day of the month, the value (00-31)
%e	Day of the month, the value (0-31)
%f	Microsecond
%H	Hour (00-23)
%h	Hour (01-12)
%I	Hour (01-12)
%i	Min, value (00-59)
%j	On the day (001-366)
%k	Hour (0-23)
%l	Hour (1-12)
%M	Month name
%m	Month, numeric (00-12)
%p	AM or PM
%r	Time, 12 hours (hh: mm: ss AM or PM)
%S	Sec (00-59)
%s	Sec (00-59)
%T	Time, 24 hours (hh: mm: ss)
% U	Week (00-53) Sunday is the first day of the week
in%	Week (00-53) Monday is the first day of the week
% V	Week (01-53) Sunday is the first day of the week, and use% X
% v	Week (01-53) Monday is the first day of the week, with the use of% x
%W	Weekday name
%w	Day of the week (0 = Sunday, 6 = Saturday)
%X	In, where Sunday is the first day of the week, four, and use% V
%x	In which the first day of the week is Monday, 4, use% v
%Y	Year 4
%Y	Year 2

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