-- find oid of table
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 ~ '^a$'
ORDER BY 2, 3;

-- find indexes

SELECT relhasindex, relkind, relchecks, reltriggers, relhasrules
FROM pg_catalog.pg_class WHERE oid = '310887'
	and attnotnull is true;

--- list indexes

SELECT a.attname,
  pg_catalog.format_type(a.atttypid, a.atttypmod),
  a.attnotnull, a.atthasdef, a.attnum
FROM pg_catalog.pg_attribute a
WHERE a.attrelid = '310887' AND a.attnum > 0 AND NOT a.attisdropped
	and attnotnull is true
ORDER BY a.attnum;

--- get default for field which is index

SELECT substring(d.adsrc for 128) FROM pg_catalog.pg_attrdef d
WHERE d.adrelid = '310887' AND d.adnum = 1;

--- dump index definition

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 = '310887' AND c.oid = i.indrelid AND i.indexrelid = c2.oid
ORDER BY i.indisprimary DESC, i.indisunique DESC, c2.relname;

---- get triggers

SELECT t.tgname
FROM pg_catalog.pg_trigger t
WHERE t.tgrelid = '310887' and (not tgisconstraint  OR NOT EXISTS  (SELECT 1 FROM pg_catalog.pg_depend d    JOIN
 pg_catalog.pg_constraint c ON (d.refclassid = c.tableoid AND d.refobjid = c.oid)    WHERE d.classid = t.tableoid AND d.objid =
 t.oid AND d.deptype = 'i' AND c.contype = 'f'));

---- get constrains

SELECT conname,
  pg_catalog.pg_get_constraintdef(oid) as condef
FROM pg_catalog.pg_constraint r
WHERE r.conrelid = '310887' AND r.contype = 'f';