Question

Have this query:

SELECT HOUR( DATE ) AS hr, COUNT( * ) AS cnt
FROM users
GROUP BY hr
ORDER BY cnt DESC

DATE is a DATETIME field and the above query shows me the most common hours in the date field.

I’m trying to improve it but not sure how to do it, I want to break it down by week days and within each week day to most common hours.

Answer 1

Try this query –

SELECT
  DAYOFWEEK(DATE) AS wd,
  HOUR(DATE) AS hr,
  COUNT(*) AS cnt
FROM 
 users
GROUP BY
  wd, hr
ORDER BY
  cnt DESC

---

SELECT
  DATE_FORMAT(DATE, '%a') AS wd, -- or DATE_FORMAT(DATE, '%W')
  HOUR(DATE) AS hr,
  COUNT(*) AS cnt
FROM 
 users
GROUP BY
  wd, hr
ORDER BY
  cnt DESC