From: Erwin Brandstetter <brandstetter@falter.at>
To: pgsql-docs@postgresql.org
Subject: Reference function arguments by name
Date: Thu, 09 May 2013 22:46:35 +0200
Message-ID: <518C0B2B.9040909@falter.at> (raw)
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-docs>
Hi!
The manual says here:
http://www.postgresql.org/docs/current/interactive/sql-createfunction.htmlhttp://www.postgresql.org/docs/devel/static/sql-createfunction.html> argname
>
> The name of an argument. Some languages (currently only PL/pgSQL)
> let you use the name in the function body. For other languages the
> name of an input argument is just extra documentation, so far as
> the function itself is concerned; but you can use input argument
> names when calling a function to improve readability (see Section
> 4.3
> <http://www.postgresql.org/docs/current/interactive/sql-syntax-calling-funcs.html;).
> In any case, the name of an output argument is significant,
> because it defines the column name in the result row type. (If you
> omit the name for an output argument, the system will choose a
> default column name.)
>
This has changed in version 9.2. SQL functions can reference the name. Ergo:
s /(currently only PL/pgSQL) / (currently only PL/pgSQL and SQL)
I tested it and it's /correctly /documented here:
http://www.postgresql.org/docs/current/interactive/xfunc-sql.html#XFUNC-SQL-FUNCTION-ARGUMENTS
> Arguments of a SQL function can be referenced in the function body
using either names or numbers.
Regards
Erwin
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Subject: Re: Reference function arguments by name
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