Re: Repear operations on 50 tables of the same schema?

On 2/27/23 05:53, celati Laurent wrote:
>
> Good morning,
> I am new to Postgresql. I have 50 tables into a "ign" schema (schema other
> than public).
> I would like for each of these 50 tables:
>
> - Add a prefix to the name of the table: "IGN_bdTopo_"
> - Add a suffix to the table name: "_V1"
> - create a new "date" column of date type. And populate this field with
> the value: 06/15/2021
> - create a new "source" column of type varchar (length 50). And populate
> this field with the value: 'ign'.
> - move all the elements of these 50 tables (including all). from the "ign"
> schema to the "ign_v2" schema. Whether data, constraints, indexes.
>
> If someone could  help me? Thank you so much.

This is what I'd do, just to get it done.  It presumes you know bash
scripting, and how to use psql.

https://www.postgresql.org/docs/13/sql-createschema.html
https://www.postgresql.org/docs/13/sql-altertable.html

First, CREATE SCHEMA ign_v2;

Write a bash script that uses psql queries information_schema.tables. 
There's be a for loop for all the tables.

Inside the loop, still using bash, and using psql:
1. create the new table name then execute "ALTER TABLE ... RENAME TO ...;",
2. ALTER TABLE (new_name) ADD COLUMN some_date DATE, ADD COLUMN some_source
varchar(50);
3. UPDATE (new_name) SET some_date = '2021-06-15'::date, some_source = 'ign';
4. ALTER TABLE (new_name) SET SCHEMA ign_v2;

--
Born in Arizona, moved to Babylonia.