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Note 1249 Select 3 was reduced during optimization
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Note 1249 Select 2 was reduced during optimization
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EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1 UNION SELECT 3);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t2 index NULL id 5 NULL 2 100.00 Using where; Using index