Обсуждение: Is there a way to build a query based on data in a table?

Hello,

From what I know, in pure SQL, it is not possible to perform what you want.

But it is feasible in PL/pgSQL (and this script language is supported
by default by postgresql...).

Regards,
Brice

2013/8/28 Herouth Maoz <herouth@unicell.co.il>:
> Hello.
>
> I want to run an automatic archiving SQL script, that looks at a meta-table
> containing data about the tables to be archived.
>
> Basically, suppose I have this data in the meta-table:
>
> table_name varchar(100)
> datetime_column_name varchar(100)
> archive_interval interval
>
> Like this:
> public.foo     |   foo_date   |  1 day
> schema1.bar    |   bar_time   |  2 day
>
> And for each such table I want to run a query like
>
> INSERT INTO foo__archive
> SELECT * FROM foo
> WHERE foo_date < timestamp 'today' - interval '1 day'
> ;
>
> And I want to build this dynamically and run it based on the table above. Is
> there any way of doing this? I mean, not by doing text manipulation in a
> programming language?
>
>
>
>
>
> Herouth