Re: describe table query? - Mailing list pgsql-general

\d bubba
and select format_type ... is fine, but I want column name,column type,column
size,column precision with any select command (type form \d exchange with
column_type,column_size and column_precision)
Is it possible ?

regards
Haris Peco
On Tuesday 10 September 2002 06:09 pm, scott.marlowe wrote:
> There are two ways to do this.  One is the postgresql specific way, which
> is to crank up psql with the -E switch, then issue a \d for a table, and
> copy out the sql query that goes by.  On my 7.2.1 box, that gives me a
> set of queries like so for a table named 'bubba':
> smarlowe=# \d bubba
>
> ********* QUERY **********
> SELECT relhasindex, relkind, relchecks, reltriggers, relhasrules
> FROM pg_class WHERE relname='bubba'
> **************************
>
> This NEXT one describes the table for us:
>
> ********* QUERY **********
> SELECT a.attname, format_type(a.atttypid, a.atttypmod), a.attnotnull,
> a.atthasdef, a.attnum
> FROM pg_class c, pg_attribute a
> WHERE c.relname = 'bubba'
>   AND a.attnum > 0 AND a.attrelid = c.oid
> ORDER BY a.attnum
> **************************
>
> This one tells us what indexes it has:
>
> ********* QUERY **********
> SELECT c2.relname
> FROM pg_class c, pg_class c2, pg_index i
> WHERE c.relname = 'bubba' AND c.oid = i.indrelid AND i.indexrelid = c2.oid
> AND NOT i.indisunique ORDER BY c2.relname
> **************************
>
> I'm not sure what the next two do, I think they have to do with foreign
> keys.
> ********* QUERY **********
> SELECT c2.relname
> FROM pg_class c, pg_class c2, pg_index i
> WHERE c.relname = 'bubba' AND c.oid = i.indrelid AND i.indexrelid = c2.oid
> AND i.indisprimary AND i.indisunique ORDER BY c2.relname
> **************************
>
> ********* QUERY **********
> SELECT c2.relname
> FROM pg_class c, pg_class c2, pg_index i
> WHERE c.relname = 'bubba' AND c.oid = i.indrelid AND i.indexrelid = c2.oid
> AND NOT i.indisprimary AND i.indisunique ORDER BY c2.relname
> **************************
>
> This one gives us our constraints:
> ********* QUERY **********
> SELECT rcsrc, rcname
> FROM pg_relcheck r, pg_class c
> WHERE c.relname='bubba' AND c.oid = r.rcrelid
> **************************
>
>
> The other way to do it is to issue a single query of the form "Select *
> from table limit 1" and use pg_num_fields, pg_field_name and
> pg_field_type commands to walk the returned fields to find their name and
> type.  The advantage of this method is that it is somewhat more
> transportable to other dbmses.
>
> On Mon, 9 Sep 2002, Dan Ostrowski wrote:
> > I also would love to know how you do this,  because I am REALLY missing
> > the "DESCRIBE <table>" calls...
> >
> > I work with mostly PHP4...
> >
> > please help!
> >
> > regards,
> > dan
> >
> > On Tue, 10 Sep 2002 03:07:46 +0200
> >
> > snpe <snpe@snpe.co.yu> wrote:
> > > If You use java then that is DatabaseMetaData.getColumns etc
> > >
> > > regards
> > > Haris Peco
> > >
> > > On Monday 09 September 2002 11:30 pm, Andrew Bulmer wrote:
> > > > I'm trying to write an Access clone in java that will
> > > > use PostGres as a backend. Problem is, I need to be
> > > > able to list all the fields (and data types) in a
> > > > table. I know about "\d" but that only seems to work
> > > > on the command line client (doesn't work if I pass it
> > > > in as a query). I know in mysql DESCRIBE <table> will
> > > > do it... is there an equivalent in postgres? I tried
> > > > google but all I could find were references to the \d command.
> > > >
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