Question

The problem I’m running into is when running this query it starts the week interval from the current date (minus 7 days from current date). I want to do all previous 10 weeks (Sun-Mon). So if my current date is on a Monday, Tuesday, or Wednesday, I want it to start on the most recent Sunday then look back at the previous 10 weeks. I believe I have to use WEEKDAY or DAYOFWEEK in the DATE_SUB but have tried with no avail:

SELECT
    SUM(MT.QUANTITY) as qty,
    WEEKDAY(MT.TRANS_DATE) AS WEEKDAY,
    WEEK(MT.TRANS_DATE) AS WEEK,
    YEAR(MT.TRANS_DATE) AS YEAR
FROM
    mytable MT
WHERE
        MT.TRANS_DATE > DATE_SUB(CURDATE(), INTERVAL 10 WEEK)
GROUP BY WEEK

Answer 1

Try with DATE_SUB(STR_TO_DATE(CONCAT(YEAR(CURDATE()),WEEK(CURDATE()),' Sunday'), '%X%V %W'),INTERVAL 10 WEEK), like this:

SELECT
    SUM(MT.QUANTITY) as qty,
    WEEKDAY(MT.TRANS_DATE) AS WEEKDAY,
    WEEK(MT.TRANS_DATE) AS WEEK,
    YEAR(MT.TRANS_DATE) AS YEAR
FROM
    mytable MT
WHERE
        MT.TRANS_DATE > DATE_SUB(STR_TO_DATE(CONCAT(YEAR(CURDATE()),WEEK(CURDATE()),' Sunday'), '%X%V %W'),INTERVAL 10 WEEK)
GROUP BY WEEK

Also you can use the other way pilcrow suggested:

SUBDATE(CURDATE(), DAYOFWEEK(CURDATE()) - 1)

Which is a little more readable…