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CREATE TABLE tab( year INT, amount INT, month INT); INSERT INTO tab VALUES (2020, 150, 1), (2019, 220, 2), (2020, 34, 2), (2020, 54, 3), (2020, 84, 4), (2019, 120, 3);
SET @sql = NULL; SELECT GROUP_CONCAT( DISTINCT CONCAT( 'SUM(CASE WHEN month = ', month,' THEN AMOUNT ELSE 0 END) AS m',month ) ) INTO @sql FROM tab; SET @sql = CONCAT('SELECT year,',@sql,' FROM tab GROUP BY year'); PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;
year
m1
m2
m3
m4
2020
150
34
54
84
2019
0
220
120
0