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array_offset() and array_offsets()

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These functions return the offset position or positions of a value in an
array.

Author: Pavel Stěhule
Reviewed by: Jim Nasby
This commit is contained in:
Alvaro Herrera
2015-03-18 16:01:34 -03:00
parent f9dead5624
commit 13dbc7a824
10 changed files with 525 additions and 8 deletions
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19
doc/src/sgml/array.sgml
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@ -600,6 +600,25 @@ SELECT * FROM sal_emp WHERE pay_by_quarter && ARRAY[10000];
index, as described in <xref linkend="indexes-types">.
</para>
<para>
You can also search for specific values in an array using the <function>array_offset</>
and <function>array_offsets</> functions. The former returns the position of
the first occurrence of a value in an array; the latter returns an array with the
positions of all occurrences of the value in the array. For example:
<programlisting>
SELECT array_offset(ARRAY['sun','mon','tue','wed','thu','fri','sat'], 'mon');
array_offset
--------------
2
SELECT array_offsets(ARRAY[1, 4, 3, 1, 3, 4, 2, 1], 1);
array_offsets
---------------
{1,4,8}
</programlisting>
</para>
<tip>
<para>
Arrays are not sets; searching for specific array elements