What does the following query return (two columns)?CREATE TABLE a(x INT); INSERT INTO a VALUES (1),(2),(2); CREATE TABLE b(x INT); INSERT I…

What does the following query return (two columns)?

CREATE TABLE a(x INT); INSERT INTO a VALUES (1),(2),(2);
CREATE TABLE b(x INT); INSERT INTO b VALUES (2),(3);
SELECT (SELECT COUNT(*) FROM (SELECT x FROM a UNION SELECT x FROM b) AS t1),
       (SELECT COUNT(*) FROM (SELECT x FROM a UNION ALL SELECT x FROM b) AS t2);