mysql group query by time

Mysql group query method by time: use the function [DATE_FORMAT (date, format)], date is the field name of the time type in the table, and format time output format.

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Mysql group query method by time:

DATE_FORMAT(date,format): Function is used to display date/time data in different formats.

Parameters:

• #date: The name of the time type field in the table.

• format: time output format.

• format format:

• # #Statistics by year: SELECT DATE_FORMAT(date,'%Y') time,SUM(field name to be counted) FROM table name WHERE condition GROUP BY time

• Statistics by month: SELECT DATE_FORMAT(date,'%Y-%m') time,SUM(field name to be counted) FROM table name WHERE condition GROUP BY time

• Statistics by week: SELECT DATE_FORMAT(date ,'%Y-%m-%d') time,SUM (field name to be counted) FROM table name WHERE condition GROUP BY time

• Statistics by day: SELECT DATE_FORMAT(date ,'%Y-%m') time,SUM (field name to be counted) FROM table name WHERE condition GROUP BY time

• Statistics by week: SELECT DATE_FORMAT(date,'% Y-%u') time, SUM (field name that needs statistics) FROM table name WHERE condition GROUP BY time

SELECT DATE_FORMAT(come_time,'%Y') year,count(*) value FROM user where registration_time >'2017'GROUP BY year

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