Re: Converting char to varchar automatically

Hi!

> That looks sane, though you didn't need the WITH.

I changed select to code below.
If same table name appears in multiple schemas, it generates duplicate alter
column clauses which cause error.
How to fix it to generate proper sql ?

I added n.nspname='myschame' as shown in code below but problem persists.

Andrus.

SELECT 'ALTER TABLE ' || quote_ident(n.nspname) || '.'
            || quote_ident(c.relname) || ' ' ||
  string_agg(
      ' ALTER COLUMN ' || quote_ident(a.attname) || ' TYPE varchar(' ||
i.character_maximum_length ||')',
      ',' ) || ';' as statement
  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
and n.nspname='myschema'
group by n.nspname, c.relname