SELECT 1 LIMIT 0; Empty set (0.00 sec) SELECT 2 LIMIT 0; Empty set (0.00 sec) SELECT NULL LIMIT 0; Empty set (0.00 sec)
Exactly what I’d expect. So here’s the question:
SELECT '1 = 1' AS equality, (SELECT 1 LIMIT 0) = (SELECT 1 LIMIT 0) AS result UNION SELECT '1 = 2', (SELECT 1 LIMIT 0) = (SELECT 2 LIMIT 0) UNION SELECT '1 = NULL', (SELECT 1 LIMIT 0) = (SELECT NULL LIMIT 0);
What do you think? Are all empty sets created identical?
Show Answer ▼
