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Add generate_subscripts, a series-generation function which generates an

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array's subscripts.

Pavel Stehule, some editorialization by me.
This commit is contained in:
Alvaro Herrera
2008-04-28 14:48:58 +00:00
parent a1d479f518
commit 1fcb977a13
7 changed files with 253 additions and 6 deletions
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17
doc/src/sgml/array.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/array.sgml,v 1.65 2008/04/27 04:33:27 alvherre Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/array.sgml,v 1.66 2008/04/28 14:48:57 alvherre Exp $ -->
<sect1 id="arrays">
<title>Arrays</title>
@ -542,6 +542,21 @@ SELECT * FROM sal_emp WHERE 10000 = ALL (pay_by_quarter);
</para>
<para>
Alternatively, the <function>generate_subscripts</> function can be used.
For example:
<programlisting>
SELECT * FROM
(SELECT pay_by_quarter,
generate_subscripts(pay_by_quarter, 1) AS s
FROM sal_emp) AS foo
WHERE pay_by_quarter[s] = 10000;
</programlisting>
This function is described in <xref linkend="functions-srf-subscripts">.
</para>
<tip>
<para>
Arrays are not sets; searching for specific array elements