2009/7/9 Tom Lane :
> =?UTF-8?Q?Grzegorz_Ja=C5=9Bkiewicz?= writes:
>> On Thu, Jul 9, 2009 at 5:26 PM, Craig James
>> wrote:
>>> Suppose I have a large table with a small-cardinality CATEGORY column (say,
>>> categories 1..5). I need to sort by an arbitrary (i.e. user-specified)
>>> mapping of CA
> On Thu, Jul 09, 2009 at 09:26:42AM -0700, Craig James wrote:
> You can do it like this:
> select c.*
> from categories c, ( values (1, 'z'), (2, 'a'), (3, 'b'), (4, 'w'),
(5,
> 'h') ) as o (id, ordering) on c.id = o.id
> order by o.ordering
Another option would be:
select c.*
from categories c
On Thu, Jul 09, 2009 at 09:26:42AM -0700, Craig James wrote:
> Suppose I have a large table with a small-cardinality CATEGORY column (say,
> categories 1..5). I need to sort by an arbitrary (i.e. user-specified)
> mapping of CATEGORY, something like this:
>
> 1 => 'z'
> 2 => 'a'
> 3 => 'b'
>
On Thu, Jul 9, 2009 at 6:26 PM, Craig James wrote:
> Suppose I have a large table with a small-cardinality CATEGORY column (say,
> categories 1..5). I need to sort by an arbitrary (i.e. user-specified)
> mapping of CATEGORY, something like this:
>
> 1 => 'z'
> 2 => 'a'
> 3 => 'b'
> 4 => 'w'
>
Craig James wrote:
> Suppose I have a large table with a small-cardinality CATEGORY
> column (say, categories 1..5). I need to sort by an arbitrary
> (i.e. user-specified) mapping of CATEGORY
There was a recent thread discussing ways to do that:
http://archives.postgresql.org/pgsql-admin/200
=?UTF-8?Q?Grzegorz_Ja=C5=9Bkiewicz?= writes:
> On Thu, Jul 9, 2009 at 5:26 PM, Craig James wrote:
>> Suppose I have a large table with a small-cardinality CATEGORY column (say,
>> categories 1..5). Â I need to sort by an arbitrary (i.e. user-specified)
>> mapping of CATEGORY, something like this:
On Thu, Jul 9, 2009 at 5:26 PM, Craig James wrote:
> Suppose I have a large table with a small-cardinality CATEGORY column (say,
> categories 1..5). I need to sort by an arbitrary (i.e. user-specified)
> mapping of CATEGORY, something like this:
>
> 1 => 'z'
> 2 => 'a'
> 3 => 'b'
> 4 => 'w'
>
Suppose I have a large table with a small-cardinality CATEGORY column (say,
categories 1..5). I need to sort by an arbitrary (i.e. user-specified) mapping
of CATEGORY, something like this:
1 => 'z'
2 => 'a'
3 => 'b'
4 => 'w'
5 => 'h'
So when I get done, the sort order should be 2,3,5,4,1
