level box
1 1
2 2
3 2
1 3
2 1
2 3
2 3
3 1
box1 box2 box3
level1 1 0 1
level2 1 1 2
level3 1 1 0
SELECT
CONCAT('level', level) AS levelname,
COUNT(CASE WHEN box = 1 THEN box ELSE NULL END) AS box1,
COUNT(CASE WHEN box = 2 THEN box ELSE NULL END) AS box2,
COUNT(CASE WHEN box = 3 THEN box ELSE NULL END) AS box3
FROM tbl
GROUP BY levelname
SELECT
CONCAT('level', a.level) AS levelname,
b1.num AS box1,
b2.num AS box2,
b3.num AS box3
FROM
table a
LEFT JOIN (SELECT level, COUNT(*) AS num FROM table WHERE box = 1) b1 ON a.level = b1.level
LEFT JOIN (SELECT level, COUNT(*) AS num FROM table WHERE box = 2) b2 ON a.level = b2.level
LEFT JOIN (SELECT level, COUNT(*) AS num FROM table WHERE box = 3) b3 ON a.level = b3.level