NOT EXISTS ; sql
solution to odd action at NOT IN (...only result)
(avoid record If NULL is included)
SELECT * FROM members; id | name | age | home ----+---------+-----+--------- 1 | takagi | 23 | tottori 2 | kinashi | 19 | tottori 3 | itano | 20 | osaka 4 | kasai | 20 | osaka 5 | mishima | 21 | hyogo 6 | imano | 23 | hyogo 7 | otani | | tottori <<< age is NULL
SELECT * FROM members AS main_m WHERE NOT EXISTS (SELECT * FROM members AS sub_m WHERE main_m.age IS NULL OR main_m.home = 'tottori'); id | name | age | home ----+---------+-----+------- 3 | itano | 20 | osaka 4 | kasai | 20 | osaka 5 | mishima | 21 | hyogo 6 | imano | 23 | hyogo
memo...
NOT EXISTS (... age IS NULL OR home = 'tottori'); . EXISTS (... IS NOT NULL AND home <> 'tottori');