Re: Date Interval

In article <200512061654(dot)jB6Gs5d14178(at)candle(dot)pha(dot)pa(dot)us>,
Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)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