MySQL: Select multiple max values from one column - mysql

Question

Suppose I got this table:
mytable
+------+-------+
| type | count |
+------+-------+
| red | 4 |
| blue | 3 |
| red | 2 |
| blue | 7 |
+------+-------+
Now I want this back:
+--------+---------+
| maxRed | maxBlue |
+--------+---------+
| 4 | 7 |
+--------+---------+
How can I do this?
This is what I tried
SELECT MAX(count) as maxRed, 0 as maxBlue FROM mytable WHERE type='red'
UNION
SELECT 0 as maxRed, MAX(count) as maxBlue FROM mytable WHERE type='blue'
but it does not quite work and only results
+--------+---------+
| maxRed | maxBlue |
+--------+---------+
| 4 | 0 |
| 0 | 7 |
+--------+---------+

Answer 1

For your query to work you only needed to wrap it with another query:
SELECT MAX(maxRed) as maxRed, MAX(maxBlue) as maxBlue
FROM(
SELECT MAX(count) as maxRed, 0 as maxBlue FROM mytable WHERE type='red'
UNION
SELECT 0 as maxRed, MAX(count) as maxBlue FROM mytable WHERE type='blue') t
A more elegant way is conditional aggregation:
SELECT MAX(CASE WHEN t.type = 'red' THEN t.count END) as maxRed,
MAX(CASE WHEN t.type = 'blue' THEN t.count END) as maxBlue
FROM mytable t
WHERE t.type IN('blue','red')

Answer 2

This is how to do it:
SELECT
MAX(CASE WHEN type = 'red' THEN `count` ELSE NULL END) AS maxRed,
MAX(CASE WHEN type = 'blue' THEN `count` ELSE NULL END) AS maxBlue
FROM
mytable
WHERE type IN ('red', 'blue');

Answer 3

SELECT type,MAX(count) FROM mytable group by type
This will return type and maxcount in vertical and not horizontal and is scalable for n number of records.
If horizontal data doesn't matter otherwise you can use above suggested answers to use case but it will require case when then for each distinct value of data.

Answer 4

EDIT
Because of the comments below I tested it on real data, my version is a bit faster for a large table ,when mytable is indexed. For those who argue about it please test yourself and report back.
select
(select max(count) from mytable WHERE type='red') aa,
(select max(count) from mytable WHERE type='blue') bb