Re: column names, types, properties for a table

> Is it possible to issue an SQL query that lists column names, types (int,
> varchar, boolean, etc.), properties (like NOT NULL or UNIQUE)
> for a given table name ?

Start psql with the -E option. Then "\d yourtable". It will print out
the queries that are run internally to show you the table info... for
example:

% psql -E cc_8004
Welcome to psql 7.4.2, the PostgreSQL interactive terminal.

Type: \copyright for distribution terms
\h for help with SQL commands
\? for help on internal slash commands
\g or terminate with semicolon to execute query
\q to quit

cc_8004=# \d rep_general;
********* QUERY **********
SELECT c.oid,
n.nspname,
c.relname
FROM pg_catalog.pg_class c
LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE pg_catalog.pg_table_is_visible(c.oid)
AND c.relname ~ '^rep_general$'
ORDER BY 2, 3;
**************************

********* QUERY **********
SELECT relhasindex, relkind, relchecks, reltriggers, relhasrules
FROM pg_catalog.pg_class WHERE oid = '21548032'
**************************

********* QUERY **********
SELECT a.attname,
pg_catalog.format_type(a.atttypid, a.atttypmod),
(SELECT substring(d.adsrc for 128) FROM pg_catalog.pg_attrdef d
WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef),
a.attnotnull, a.attnum
FROM pg_catalog.pg_attribute a
WHERE a.attrelid = '21548032' AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum
**************************

********* QUERY **********
SELECT c2.relname, i.indisprimary, i.indisunique,
pg_catalog.pg_get_indexdef(i.indexrelid)
FROM pg_catalog.pg_class c, pg_catalog.pg_class c2, pg_catalog.pg_index i
WHERE c.oid = '21548032' AND c.oid = i.indrelid AND i.indexrelid = c2.oid
ORDER BY i.indisprimary DESC, i.indisunique DESC, c2.relname
**************************

********* QUERY **********
SELECT c.relname FROM pg_catalog.pg_class c, pg_catalog.pg_inherits i
WHERE c.oid=i.inhparent AND i.inhrelid = '21548032' ORDER BY inhseqno ASC
**************************

Table "public.rep_general"
Column | Type | Modifiers
-------------------------+-----------------------------+--------------------
id | integer | not null
loc_id | integer | not null
dt | timestamp without time zone | not null
num_active_visits | integer | not null default 0
num_passive_visits | integer | not null default 0
min_visit_length | integer | not null default 0
max_visit_length | integer | not null default 0
total_visit_length | integer | not null default 0
total_time_before_touch | integer | not null default 0
total_time_of_touch | integer | not null default 0
num_coupons_printed | integer | not null default 0
num_passive_promos | integer | not null default 0
num_active_promos | integer | not null default 0
Indexes:
"rep_general_pk" primary key, btree (id)
"rep_general_dt_idx" btree (dt)
"rep_general_loc_id_idx" btree (loc_id)

cc_8004=#