Re: Converting char to varchar automatically
От | Andrus |
---|---|
Тема | Re: Converting char to varchar automatically |
Дата | |
Msg-id | E6181F78CA7B4C21AAC815163AFE2789@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!
>There really is no easy way to make a single ALTER for each table unless you use a programming language.
I’snt SQL a programming language ?
>However, adding a GROUP BY c.relname, a.attname
>would certainly simplify editing. Then you can combine all the
>ALTER COLUMN's for each table.
>would certainly simplify editing. Then you can combine all the
>ALTER COLUMN's for each table.
I wrote
with stem as (
SELECT 'ALTER TABLE ' || quote_ident(n.nspname) || '.'
|| quote_ident(c.relname) as prefix ,
string_agg(
' ALTER COLUMN ' || quote_ident(a.attname) || ' TYPE varchar(' || i.character_maximum_length ||')',
',' ) as body
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
group by 1
)
select prefix || ' '|| body || ';' as statement
from stem
Is this prefect ?
Andrus.
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