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CREATE TABLE user_action ( user_id int, del timestamp, pref timestamp ); INSERT INTO user_action VALUES (1,'2022/05/07 17:23','2022/05/07 17:23'); INSERT INTO user_action VALUES (2,'2022/05/06 17:22','2022/05/08 17:24');
SELECT del = pref FROM user_action; SELECT COUNT(del = pref) FROM user_action; SELECT SUM(del = pref) FROM user_action;
del = pref
1
0
COUNT(del = pref)
2
SUM(del = pref)
1