| From: | Kevin Grittner <kgrittn(at)ymail(dot)com> |
|---|---|
| To: | Rémi Cura <remi(dot)cura(at)gmail(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
| Cc: | "pgsql-bugs(at)postgresql(dot)org" <pgsql-bugs(at)postgresql(dot)org> |
| Subject: | Re: BUG #8317: ROUND(double*1/2) != ROUND(1/2*double) |
| Date: | 2013-07-30 21:17:36 |
| Message-ID: | 1375219056.72045.YahooMailNeo@web162903.mail.bf1.yahoo.com |
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| Lists: | pgsql-bugs |
Rémi Cura <remi(dot)cura(at)gmail(dot)com> wrote:
> According to the doc
> ( http://www.postgresql.org/docs/9.2/static/sql-syntax-lexical.html#SQL-SYNTAX-OPERATORS ),
> multiplication has precedence on division. (I supposed it implicitely)
The correct link is:
http://www.postgresql.org/docs/9.2/static/sql-syntax-lexical.html#SQL-PRECEDENCE-TABLE
And it shows multiplication, division, and modulo as having equal
precedence, with left-to-right associativity.
> So anyway the query is parsed as ( 1/ (2*3.2)) and ( 3.2*1) / 2 ),
No, it is ((1 / 2) * 3.2) and ((3.2 * 1) / 2).
Those evaluate to (0 * 3.2) and (3.2 / 2), respectively.
--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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