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c417da24a3
try the first unique key as a surrogate PK *before* disabling extended keys because of missing PK
20 lines
618 B
Text
20 lines
618 B
Text
create table t1 (c1 int not null, c2 int, unique index(c1), index (c2)) engine=innodb;
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insert into t1 (c1, c2) select 1, round(rand()*100);
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insert into t1 (c1, c2) select (select max(c1) from t1) + c1, c1*93563%100 from t1;
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insert into t1 (c1, c2) select (select max(c1) from t1) + c1, c1*93563%100 from t1;
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insert into t1 (c1, c2) select (select max(c1) from t1) + c1, c1*93563%100 from t1;
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select count(*) from t1;
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count(*)
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8
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explain select * from t1 where c2 = 1 order by c1;
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id 1
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select_type SIMPLE
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table t1
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type ref
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possible_keys c2
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key c2
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key_len 5
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ref const
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rows 1
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Extra Using where; Using index
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drop table t1;
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