2487
2487
INSERT INTO t1 VALUES (1),(2),(3);
2488
2488
INSERT INTO t2 VALUES (2);
2489
2489
INSERT INTO t3 VALUES (3);
2490
2491
SELECT t1.id,t3.id FROM t1 JOIN t2 ON (t2.id=t1.id) LEFT JOIN t3 USING (id);
2491
2493
SELECT t1.id,t3.id FROM t1 JOIN t2 ON (t2.notacolumn=t1.id) LEFT JOIN t3 USING (id);
2492
2495
SELECT id,t3.id FROM t1 JOIN t2 ON (t2.id=t1.id) LEFT JOIN t3 USING (id);
2493
2497
SELECT id,t3.id FROM (t1 JOIN t2 ON (t2.id=t1.id)) LEFT JOIN t3 USING (id);