How to get maximum and minimum values ​​in one query?

Question

I use MySQL, and I am looking for a way to get global maximum and minimum values ​​(for the whole table) from two columns (e.g., posxand posy) using only one query.

Answer 1

Plain:

SELECT MIN(posx), MIN(posy), MAX(posx), MAX(posy) FROM table

Answer 2

SELECT
    MIN(colx) AS minimum,
    MAX(colx) AS maximum,
    MIN(coly) AS minimum,
    MAX(coly) AS maximum
FROM table

Answer 3

It really is not harder than it sounds.

SELECT MIN(posx), MAX(posx), MIN(posy), MAX(posy)
FROM yourtable

Answer 4

 select max(posx), min(posy) from table