Group rows by 7 days interval starting from a certain date

Question

Is there a way to group rows by a 7 days intervals(datetime) starting from a certain date in Mysql?

Answer 1

SELECT 
    1 + DATEDIFF(columnDate, @start_date) DIV 7  AS weekNumber
  , @start_date + INTERVAL (DATEDIFF(columnDate, @start_date) DIV 7) WEEK
      AS week_start_date
  , MIN(columnDate) AS actual_first_date
  , MAX(columnDate) AS actual_last_date
  , SUM(otherColumn)
  , AVG(otherColumn)
  --- 
FROM 
    tableX 
WHERE 
    columnDate >= @start_date 
GROUP BY
    DATEDIFF(columnDate, @start_date) DIV 7 ;

Answer 2

SELECT users.* from users 
WHERE created_at >= '2011-12-01' 
AND created_at <= date_add('2011-12-01', INTERVAL 7 DAY)

This selects the users created between 201-12-01 and 7 days after that. Make changes, to query based on your need.

Answer 3

SELECT *
FROM  `table` 
GROUP BY WEEK( ADDDATE( `date_column` , WEEKDAY(NOW()) ) )