Question

It is very easy to count all rows added lets say in june 2011, simply by using

GROUP BY YEAR(record_date), MONTH(record_date)

But I wonder how to do that while counting the number of all rows in the table at given date – that would require also counting those added before.

for example adding 5 rows per month:
i would like to result look like this: 5, 10, 15 and so on during the month.

Answer 1

SET @total = 0;
SELECT
  Year,
  Month,
  new,
  @total := @total + new AS Total 
FROM (
  SELECT
    YEAR(record_date) AS Year,
    MONTH(record_date) AS Month,
    COUNT(*) AS new
  FROM worktimes
  GROUP BY YEAR(record_date), MONTH(record_date)
 ) AS tmp;