如何在MySQL的两个字段上使用max和min搜索？

Question

i have this table(MySQL):

|id|min|max|info|
+--+---+---+----+
|1 |18 |24 | ...|
+--+---+---+----+
|2 |22 |26 | ...|

SQL:

SELECT * FROM myTable WHERE max <= 21 AND min >= 21

Result:

NULL

Solution:

SELECT * FROM myTable WHERE 21 <= max AND 21 >= min

Answer 1

There is no row with max <= 21 . In both rows max is greater than 21!