Rows are being excluded from SQL query when using MAX - mysql

Question

I have table A
A
MID----Totals
1 --------- 3
5 ----------3
2 ----------2
4 ----------1
When this is run
SELECT * FROM A HAVING A.totals=3;
Gives as expected
MID----Totals
1 --------- 3
5 ----------3
But When I run
SELECT * FROM A HAVING (A.totals=(max(A.totals));
only gives
MID----Totals
1 --------- 3
And not the second row. I need to be able to use the max value as the numbers in the total column will change. How can I do this?

Answer 1

use this query :
SELECT * FROM A HAVING A.totals=(SELECT max(B.totals) FROM A B) ;
Fiddle

Answer 2

HAVING is used with GROUP BY aggregates
Use WHERE instead
SELECT * FROM A WHERE A.totals = (SELECT MAX(A.totals) FROM A)

Answer 3

We can do something like this:
SELECT d.mid
, d.totals
FROM ( SELECT MAX(s.totals) AS max_totals FROM A s ) t
JOIN A d
ON d.totals = t.max_totals
ORDER
BY d.mid
, d.totals
We can return an equivalent result like this:
SELECT d.mid
, d.totals
FROM A d
WHERE d.totals IN ( SELECT MAX(s.totals) FROM A s )
ORDER
BY d.mid
, d.totals
The query in the question could also validly return zero rows.
The behavior is due to a MySQL (non-standard) extension. Other databases would balk at that query, returning an error. We can get MySQL to exhibit similar (more standard) behavior by including ONLY_FULL_GROUP_BY in sql_mode, and then MySQL would throw an error 1463.
Reference: https://dev.mysql.com/doc/refman/8.0/en/group-by-handling.html