From: | "David Monarchi" <david(dot)e(dot)monarchi(at)gmail(dot)com> |
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To: | pgsql-novice(at)postgresql(dot)org |
Subject: | Constructing two-dimensional arrays from a query |
Date: | 2007-11-09 00:13:28 |
Message-ID: | eea51fdb0711081613h63055a41oaaaa96969988c636@mail.gmail.com |
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Lists: | pgsql-novice |
PG 8.2
Linux
Hello -
I would like to update a two-dimensional array field in a table using pure SQL.
The field is defined as text[][]
My query produces data in the form
x, y, z
where x is the value of the key in the table I want to update
y is the value of the first element of the first subarray
z is the value of the second element of the first array
For example, part of the result of a query might be
x1 y1 z1
x1 y2 z2
x1 y3 z3
After updating the table, the row would look like this (quotes omitted
for clarity).
x1 {{y1,z1},{y2,z2},{y3,z3}}
In section 4.2.10, an examle is given using the ARRAY constructor, but
it explicitly says that the subquery must return a single column. I
don't know if this is a limitation of 8.2 or if there is a way around
this. The example in the manual is
SELECT ARRAY(SELECT oid FROM pg_proc WHERE proname LIKE 'bytea%');
Any assistance would be greatly appreciated.
Thank you,
David
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