how to get the max value in an array

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how to get the max value in an array

От:
fanngyuan <fanngyuan@gmail.com>
Дата:
hi guys:    I'm using int[] in postgrsql to store int array. I want to get max 
value of each row . While I can't find any function to get it(max 
function will get max array in one column) . Even I could write a sql 
function to get the max value. I still think a native funtion is better 
. Can your guys help me?    Thanks

Re: how to get the max value in an array

От:
Robert Haas <robertmhaas@gmail.com>
Дата:
On Thu, Jun 2, 2011 at 10:52 PM, fanngyuan  wrote:
> hi guys:
>    I'm using int[] in postgrsql to store int array. I want to get max value
> of each row . While I can't find any function to get it(max function will
> get max array in one column) . Even I could write a sql function to get the
> max value. I still think a native funtion is better . Can your guys help me?

Please post questions like this to pgsql-general, rather than here.

What you are looking for is unnest:

rhaas=# select max(x) from unnest(array[1,2,3]) x;max
-----  3
(1 row)

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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