Re: Date Interval

In article <200512061654.jB6Gs5d14178@candle.pha.pa.us>,
Bruce Momjian <pgman@candle.pha.pa.us> writes:

> Magdalena Komorowska wrote:
>> Hi,
>> I hale a problem with counting interwal and I can't find what to do with
>> this. 
>> I have two fields in the table:
>> Column       |  Type   | Modifiers
>> -----------------+---------+-----------
>> date_in         | date    |
>> interwal_months | numeric |
>> -----------------+---------+-----------
>> 
>> Query
>> SELECT date_in + INTERVAL '3 MONTH' FROM any_table
>> works fine of course. 
>> 
>> However, how to do something like that?
>> SELECT date_in + INTERVAL ' interwal_months MONTH' FROM any_table

> How about this?

>     test=> CREATE TABLE test(x TEXT);
>     CREATE TABLE
>     test=> INSERT INTO test VALUES ('3');
>     INSERT 0 1
>     test=> SELECT current_timestamp + cast(x || ' months' AS INTERVAL) FROM
>     test;
>                ?column?
>     -------------------------------
>      2006-03-06 11:53:05.574279-05
>     (1 row)

Since Magdalena doesn't store the number of months in a string, the
following might be more convenient:
 SELECT date_in + interwal_months * INTERVAL '1 MONTH' FROM any_table