Re: Converting char to varchar automatically
От | Andrus |
---|---|
Тема | Re: Converting char to varchar automatically |
Дата | |
Msg-id | 79ED1A0744DC4A51B2C242E91D58AEED@dell2 обсуждение исходный текст |
Ответ на | Re: Converting char to varchar automatically (Melvin Davidson <melvin6925@gmail.com>) |
Ответы |
Re: Converting char to varchar automatically
|
Список | pgsql-general |
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 ?
>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.
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