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Thread: array size

array size

From
akp geek
Date:
Hi all -

              I am trying to find the number of elements in the array. Right now I am using array_upper and array_lower. Is there any other way of getting the number of elements?

thanks for the help

Regards

Re: array size

From
"David Johnston"
Date:

It may help to specify why you feel that array_upper and array_lower are insufficient for your use.  I mean, you could “ count( unnest( array ) ) “ but whether that is better or worse than array_upper really depends on your needs.

 

David J.

 

From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of akp geek
Sent: Thursday, February 24, 2011 2:17 PM
To: pgsql-general
Subject: [GENERAL] array size

 

Hi all -

 

              I am trying to find the number of elements in the array. Right now I am using array_upper and array_lower. Is there any other way of getting the number of elements?

 

thanks for the help

 

Regards

Re: array size

From
Dmitriy Igrishin
Date:
Hey,

2011/2/24 akp geek <akpgeek@gmail.com>
Hi all -

              I am trying to find the number of elements in the array. Right now I am using array_upper and array_lower. Is there any other way of getting the number of elements?
You may use array_length() function, e.g.
dmitigr=> SELECT array_length(ARRAY[ARRAY[1,2,3],ARRAY[4,5,6]], 1);
 array_length
--------------
            2
(1 row)

dmitigr=> SELECT array_length(ARRAY[ARRAY[1,2,3],ARRAY[4,5,6]], 2);
 array_length
--------------
            3
(1 row)

See http://www.postgresql.org/docs/9.0/static/functions-array.html

thanks for the help

Regards



--
// Dmitriy.


Re: array size

From
akp geek
Date:
Unfortunately the our database is still 8.3. that's a limitation for using array_length

Regards

On Thu, Feb 24, 2011 at 4:08 PM, Dmitriy Igrishin <dmitigr@gmail.com> wrote:
Hey,

2011/2/24 akp geek <akpgeek@gmail.com>

Hi all -

              I am trying to find the number of elements in the array. Right now I am using array_upper and array_lower. Is there any other way of getting the number of elements?
You may use array_length() function, e.g.
dmitigr=> SELECT array_length(ARRAY[ARRAY[1,2,3],ARRAY[4,5,6]], 1);
 array_length
--------------
            2
(1 row)

dmitigr=> SELECT array_length(ARRAY[ARRAY[1,2,3],ARRAY[4,5,6]], 2);
 array_length
--------------
            3
(1 row)

See http://www.postgresql.org/docs/9.0/static/functions-array.html

thanks for the help

Regards



--
// Dmitriy.