Обсуждение: Re: GENERAL] Boolean error

The sql can be predigest to:
select random() from a where random()<0.5;
\d a
       Table "public.a"
 Column |  Type   | Modifiers
--------+---------+-----------
 a      | integer |
This query can get about a half rows in the table 'a'.
When search a row, postgresql calcuate random() twice.



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