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WITH Lecturer AS ( SELECT 1 AS lect_id, 'Andy' AS name, '2007-12-01' AS join_date, NULL AS quit_date, 20 AS no_of_leaves UNION ALL SELECT 2, 'Bob', '2014-02-15', '2016-04-31', 20 UNION ALL SELECT 3, 'Carrot', '2015-07-05', NULL, 15 ), `Leave` AS ( SELECT 101 AS leave_id, 1 AS lect_id, 3 AS used_leave UNION ALL SELECT 102, 1, 4 UNION ALL SELECT 103, 3, 6 ) SELECT l1.name, l1.lect_id, l1.no_of_leaves - COALESCE(l2.total_leave, 0) AS NoOfLeavesLeft FROM Lecturer l1 LEFT JOIN ( SELECT lect_id, SUM(used_leave) AS total_leave FROM `Leave` GROUP BY lect_id ) l2 ON l1.lect_id = l2.lect_id;
name
lect_id
NoOfLeavesLeft
Andy
1
13
Bob
2
20
Carrot
3
9