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|
---------------------------------------------------------------------------
--
-- syscat.sql-
-- sample queries to the system catalogs
--
--
-- Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
-- Portions Copyright (c) 1994, Regents of the University of California
--
-- src/tutorial/syscat.source
--
---------------------------------------------------------------------------
--
-- Sets the schema search path to pg_catalog first, so that we do not
-- need to qualify every system object
--
SET search_path TO pg_catalog;
-- The LIKE pattern language requires underscores to be escaped, so make
-- sure the backslashes are not misinterpreted.
SET standard_conforming_strings TO on;
--
-- lists the names of all database owners and the name of their database(s)
--
SELECT rolname, datname
FROM pg_roles, pg_database
WHERE pg_roles.oid = datdba
ORDER BY rolname, datname;
--
-- lists all user-defined classes
--
SELECT n.nspname, c.relname
FROM pg_class c, pg_namespace n
WHERE c.relnamespace=n.oid
and c.relkind = 'r' -- not indices, views, etc
and n.nspname not like 'pg\_%' -- not catalogs
and n.nspname != 'information_schema' -- not information_schema
ORDER BY nspname, relname;
--
-- lists all simple indices (ie. those that are defined over one simple
-- column reference)
--
SELECT n.nspname AS schema_name,
bc.relname AS class_name,
ic.relname AS index_name,
a.attname
FROM pg_namespace n,
pg_class bc, -- base class
pg_class ic, -- index class
pg_index i,
pg_attribute a -- att in base
WHERE bc.relnamespace = n.oid
and i.indrelid = bc.oid
and i.indexrelid = ic.oid
and i.indkey[0] = a.attnum
and i.indnatts = 1
and a.attrelid = bc.oid
ORDER BY schema_name, class_name, index_name, attname;
--
-- lists the user-defined attributes and their types for all user-defined
-- classes
--
SELECT n.nspname, c.relname, a.attname, format_type(t.oid, null) as typname
FROM pg_namespace n, pg_class c,
pg_attribute a, pg_type t
WHERE n.oid = c.relnamespace
and c.relkind = 'r' -- no indices
and n.nspname not like 'pg\_%' -- no catalogs
and n.nspname != 'information_schema' -- no information_schema
and a.attnum > 0 -- no system att's
and not a.attisdropped -- no dropped columns
and a.attrelid = c.oid
and a.atttypid = t.oid
ORDER BY nspname, relname, attname;
--
-- lists all user-defined base types (not including array types)
--
SELECT n.nspname, r.rolname, format_type(t.oid, null) as typname
FROM pg_type t, pg_roles r, pg_namespace n
WHERE r.oid = t.typowner
and t.typnamespace = n.oid
and t.typrelid = 0 -- no complex types
and t.typelem = 0 -- no arrays
and n.nspname not like 'pg\_%' -- no built-in types
and n.nspname != 'information_schema' -- no information_schema
ORDER BY nspname, rolname, typname;
--
-- lists all prefix operators
--
SELECT n.nspname, o.oprname AS prefix_op,
format_type(right_type.oid, null) AS operand,
format_type(result.oid, null) AS return_type
FROM pg_namespace n, pg_operator o,
pg_type right_type, pg_type result
WHERE o.oprnamespace = n.oid
and o.oprkind = 'l' -- prefix ("left unary")
and o.oprright = right_type.oid
and o.oprresult = result.oid
ORDER BY nspname, operand;
--
-- lists all infix operators
--
SELECT n.nspname, o.oprname AS binary_op,
format_type(left_type.oid, null) AS left_opr,
format_type(right_type.oid, null) AS right_opr,
format_type(result.oid, null) AS return_type
FROM pg_namespace n, pg_operator o, pg_type left_type,
pg_type right_type, pg_type result
WHERE o.oprnamespace = n.oid
and o.oprkind = 'b' -- infix ("binary")
and o.oprleft = left_type.oid
and o.oprright = right_type.oid
and o.oprresult = result.oid
ORDER BY nspname, left_opr, right_opr;
--
-- lists the name, number of arguments and the return type of all user-defined
-- C functions
--
SELECT n.nspname, p.proname, p.pronargs, format_type(t.oid, null) as return_type
FROM pg_namespace n, pg_proc p,
pg_language l, pg_type t
WHERE p.pronamespace = n.oid
and n.nspname not like 'pg\_%' -- no catalogs
and n.nspname != 'information_schema' -- no information_schema
and p.prolang = l.oid
and p.prorettype = t.oid
and l.lanname = 'c'
ORDER BY nspname, proname, pronargs, return_type;
--
-- lists all aggregate functions and the types to which they can be applied
--
SELECT n.nspname, p.proname, format_type(t.oid, null) as typname
FROM pg_namespace n, pg_aggregate a,
pg_proc p, pg_type t
WHERE p.pronamespace = n.oid
and a.aggfnoid = p.oid
and p.proargtypes[0] = t.oid
ORDER BY nspname, proname, typname;
--
-- lists all the operator families that can be used with each access method
-- as well as the operators that can be used with the respective operator
-- families
--
SELECT am.amname, n.nspname, opf.opfname, opr.oprname
FROM pg_namespace n, pg_am am, pg_opfamily opf,
pg_amop amop, pg_operator opr
WHERE opf.opfnamespace = n.oid
and opf.opfmethod = am.oid
and amop.amopfamily = opf.oid
and amop.amopopr = opr.oid
ORDER BY nspname, amname, opfname, oprname;
--
-- Reset the search path and standard_conforming_strings to their defaults
--
RESET search_path;
RESET standard_conforming_strings;
|
