Обсуждение: Extract table columns in tabular form

How do you extract postgresql column names, types and comments in tabular form,
using an SQL command?. I know they are stored in one of the system tables, but
I don't know which.


R Church

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am  05.11.2005, um 16:47:56 +0000 mailte frank church folgendes:
> 
> How do you extract postgresql column names, types and comments in tabular form,
> using an SQL command?. I know they are stored in one of the system tables, but
> I don't know which.

Start psql with -E and call \d* - commands to see both the hidden SQL
and the description.

Example:

comment on table foo is 'this is a comment';
\dd foo
[many lines of output the SQL and the comment]


Use '\h?' to see all psql-commands.


HTH, Andreas
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> How do you extract postgresql column names, types and comments in tabular form,
> using an SQL command?. I know they are stored in one of the system tables, but
> I don't know which.

- Table names are in pg_class

- Column names are in pg_attribute, associated to pg_class via  "where pg_attribute.attrelid = pg_class.oid"

- Comments are in pg_description...  There seem to be links to both pg_class and pg_attribute

- Type info is in pg_type, associated to pg_attribute via "atttypid"

There are attributes that you normally don't see, and "dropped"
attributes still exist in pg_attribute, so things are a tad more
complex than what I have said, but the above 4 tables should provide
you all you need...
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