Re: [SQL] Please help: How to determine largest of two numbers in a query?

Greg -

This may not be the slickest way to do it, but it works...

SELECT yyyymmdd, key, value1 AS value
FROM greg
WHERE value1 > value2
UNION SELECT yyyymmdd, key, value2 AS value
FROM greg
WHERE value2 > value1;

I hope this helps.  :-)

Blessings,
  Adam

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Adam Maddock                                 http://Adam.Maddock.com
 Detroit, MI                                         adam@maddock.com
    "BE IMITATORS of God, therefore, as dearly loved children..."
                                                  (Ephesians 5:1)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

On Wed, 2 Dec 1998, Greg Youngblood wrote:

> I have a table with the following structure:
>     yyyymmdd    int4
>     key        char(16)
>     value1        int4
>     value2        int4
>
> with the following sample data:
>     yyyymmdd    key    value1    value2
>     19981201    hello    32    16
>     19981201    bye    29    64
>     19981202    hello    16    20
>     19981202    bye    23    13
>
> What I need is to select the greatest between value1 and value2, so the
> answer would be:
>     yyyymmdd    key    value
>     19981201    hello    32
>     19981201    bye    64
>     19981202    hello    20
>     19981202    bye    23
>
> I can do this via ODBC using access by creating a column which is defined as
> IF(value1>value2,value1,value2) but that doesn't work in psql.
>
> How can I make this work in psql?
>
> Thanks
> Greg
>