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CREATE TABLE table_1 ( `category` VARCHAR(2), `user_id` INT(2), `value` DECIMAL(3,2) ); INSERT INTO table_1 (`category`, `user_id`, `value`) VALUES ('A', 1, 0.01), ('A', 2, 0.05), ('A', 3, 0.09), ('A', 4, 0.12), ('B', 1, 0.34), ('B', 2, 0.27), ('B', 3, 0.08), ('B', 4, 0.12) ;
SELECT `category` , MAX(CASE WHEN MOD( `user_id`,2) = 1 then 'Even' ELSE 'Odd' ENd ) odds, SUM(`value`) FROM table_1 GROUP BY category, MOD( `user_id`,2) ORDER BY category, MOD( `user_id`,2) ASC
category
odds
SUM(`value`)
A
Odd
0.17
A
Even
0.10
B
Odd
0.39
B
Even
0.42