Re: unable to understand query result

On 06.07.22 11:31, Stefan Froehlich wrote:
> I have a database returing these result sets for two almost
> identical queries:
>
> #v+
> $ select id, pid, length(pid), md5(pid) from product where pid like '8000000';
> id | pid | length | md5
> ------+---------+--------+----------------------------------
> 3594 | 8000000 | 7 | 60b5792913f4acbccf45c281fa9e3c9f
> (1 row)
>
> $ select id, pid, length(pid), md5(pid) from product where pid like '%8000000';
> id | pid | length | md5
> ------+---------+--------+----------------------------------
> 3594 | 8000000 | 7 | 60b5792913f4acbccf45c281fa9e3c9f
> 722 | 8000000 | 7 | 60b5792913f4acbccf45c281fa9e3c9f
> (2 rows)
> #v-

Check the EXPLAIN output for the two queries. Maybe there is index
corruption somewhere.