Changing column names in tables

Why are there too many to fix with ALTER?

Use SQL and the data dictionary to generate the DDL and pipe it into
psql (or spool it to disk and use that file as a sql script):

psql your_db_name -t -c "select 'alter table '||t.tablename||' rename
\"'||c.column_name||'\" to '||lower(c.column_name)||';' from pg_tables
t, information_schema.columns c where t.schemaname='your_schema_name'
and c.table_name=t.tablename and c.table_schema=t.schemaname and
c.column_name<>lower(c.column_name)" | psql your_db_name

________________________________

From: pgsql-general-owner@postgresql.org
[mailto:pgsql-general-owner@postgresql.org] On Behalf Of Tony Cade
Sent: Wednesday, March 05, 2008 2:29 PM
To: pgsql-general@postgresql.org
Subject: [GENERAL] Changing column names in tables

I have an Access database that I have exported to PostgreSQL via ODBC,
which has worked ok & the data is in PostgreSQL but some of the column
names were in mixed case e.g. AccountCode

When I look at the table definitions in pgadmin these are shown in
quotes e.g."AccountCode" and any queries made that reference these
columns require the quotes.

There are too many fields to issue alter table commands to rename in SQL
so my question is , is it safe to use a query such as

select relfilenode from pg_class where relname='rates'

update pg_attribute set attname=lower(attname) where attnum >0 and
attrelid=23424

Why are there too many to fix with ALTER?

I mean that there are too many to fix with manually typed ALTER statements,
pure laziness, so I am looking at an automated method.

Use SQL and the data dictionary to generate the DDL and pipe it into psql
(or spool it to disk and use that file as a sql script):

psql *your_db_name* -t -c "select 'alter table '||t.tablename||' rename
\"'||c.column_name||'\" to '||lower(c.column_name)||';' from pg_tables t,
information_schema.columns c where t.schemaname='*your_schema_name*' and
c.table_name=t.tablename and c.table_schema=t.schemaname and c.column_name
<>lower(c.column_name)" | psql *your_db_name
*

Thank you for your suggestion I will try it.

Tony Cade