如何在单个查询中获取最大值和最小值？

Question

I'm using MySQL, and I'm looking for a way to get the global maximum and minimum values (for the whole table) from two columns (for example, posx and posy ), using only one query.

Answer 1

Simple:

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's really no more complex than it sounds.

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

Answer 4

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