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insert into t1 values ("hello"),("hello"),("hello"),("hello"),("hello"),("a"),("b"),("c"),("d"),("e"),("f"),("g"),("h"),("i");
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explain select * from t1 where btn like "i%";
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id select_type table type possible_keys key key_len ref rows Extra
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explain select * from t1 where btn like "h%";
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id select_type table type possible_keys key key_len ref rows Extra
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explain select * from t1 where btn like "a%";
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id select_type table type possible_keys key key_len ref rows Extra
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explain select * from t1 where btn like "b%";
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id select_type table type possible_keys key key_len ref rows Extra
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select * from t1 where btn like "ff%";
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select * from t1 where btn like " %";