SQL লিখি:

SELECT
FROM
WHERE
GROUP BY
HAVING
ORDER BY

কিন্তু logically roughly execute হয়:

FROM / JOIN
      ↓
WHERE
      ↓
GROUP BY
      ↓
HAVING
      ↓
SELECT
      ↓
DISTINCT
      ↓
ORDER BY
      ↓
LIMIT

এই order বুঝলে অনেক SQL confusion clear হয়ে যায়।