Suppose...
SELECT brand, model, revision, SUM(quantity)
FROM stock
GROUP BY brand, model, revision
This is not solved by using distinct as you would not get the correct count.Group By All allows you to write it a bit more compact...
SELECT brand, model, revision, SUM(quantity)
FROM stock
GROUP BY ALLI revert to “group by 1, 2, 3… “ when I’m just hacking about. Group by all would definitely be an improvement.