Re: How to remove an item from integer array type

2013/2/21 ChoonSoo Park <luispark(at)gmail(dot)com>
>
> Hello Gurus,
>
> Table A has integer[] column. I need to delete specific integer value from that column.
>
> f1 | f2
> 1 {100, 101, 102, 103}
> 2 {200, 300, 400}
>
> I want to remove 101 from f2 and also preserve the order.
>
> f1 | f2
> 1 {100, 102, 103}
> 2 {200, 300, 400}
>
> I tried the following query and it did remove the 101 but it didn't preserve the order.
> update tableA set f2 = (select array_agg(X.id) from (select unnest(f2) id except select 101 id) X) where f1 = 1;
>
> What's the best way to do this?

Assuming you want to keep the values in numeric order, add an ORDER BY:

update tableA set f2 = (select array_agg(X.id) from (select unnest(f2)
id except select 101 id ORDER BY id) X) where f1 = 1;

HTH

Ian Barwick