How can I sort the fields according to my rules?

Question

PHP

Hello! There is a sign. I need to select all the values ​​​​from the table according to the one defined through Where, and if the values ​​\u200b\u200bare less than 24, then add random values ​​\u200b\u200bto make it 24 in the end. For example, we are looking for the city in the table, and we are given 15 points with Moscow, the remaining 9 points are given randomly from the table.

Answer 1

Make two requests and connect in PHP. It will be easier.

Answer 2

clumsily - do SELECT with UNION in advance - and choose LIMIT 24. Extremely inefficient.
a little less clumsily - write a storage that itself will "get" to 24 only if it is not enough. More effective.