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4 lines
272 B
SQL
4 lines
272 B
SQL
explain select key1,key2,key3 from t1 where key1=100 and key2=100 and key3=100;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge key1,key2,key3 key1,key2,key3 5,5,5 NULL 2 Using intersect(key1,key2,key3); Using where; Using index
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