Again sorry for count(a), I wrote too fast. I understand of course about
null values.
Otherwise by rowid I mean the autogenerated primary key. In my actual
case, I have a field as alias.
CREATE TABLE t(id integer primary key, a);
explain query plan select count(*) from t -> scan table
create index ia on t(id);
explain query plan select count(*) from t -> SCAN TABLE t USING COVERING
INDEX...
1. It means, the primary key is not as good as a cover index??
2. Is there NO WAY to quickly get the row count WITHOUT full scan if I
only have the auto primary key??
Thanks,
Gabriel
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