Re: Converting char to varchar automatically - Mailing list pgsql-general
There really is no easy way to make a single ALTER for each table unless you use a programming language. However, adding a
GROUP BY c.relname,
a.attname
would certainly simplify editing. Then you can combine all theGROUP BY c.relname,
a.attname
ALTER COLUMN's for each table.
On Wed, Oct 8, 2014 at 6:21 PM, Andrus <kobruleht2@hot.ee> wrote:
Hi!Thank you.>This revised query should give you what you need:
>SELECT 'ALTER TABLE ' || quote_ident(n.nspname) || '.'
> || quote_ident(c.relname)
> || ' ALTER COLUMN ' || quote_ident(a.attname) || ' TYPE varchar(' || i.character_maximum_length || ');'
> FROM pg_class c
> JOIN pg_namespace n ON n.oid = c.relnamespace
> JOIN pg_attribute a ON a.attrelid = c.oid
> JOIN pg_type t ON t.oid = a.atttypid
> JOIN information_schema.columns i ON (i.table_name = c.relname AND i.column_name = a.attname)
>WHERE t.typname = 'bpchar'
> AND c.relkind = 'r'
> AND n.nspname <> 'pg_catalog' and not attisdropped;
How to create single alter table command for every table ?Can we use string concat aggregate function or window functions or plpgsql or something other ?Andrus.
--
Melvin Davidson
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.
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