345
345
INSERT INTO t1 VALUES (1,1), (2,1), (3,1);
346
346
EXPLAIN SELECT DISTINCT a FROM t1;
347
347
EXPLAIN SELECT DISTINCT a,b FROM t1;
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349
EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2;
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EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2