-- -- Test inheritance features -- CREATE TABLE a (aa TEXT); CREATE TABLE b (bb TEXT) INHERITS (a); CREATE TABLE c (cc TEXT) INHERITS (a); CREATE TABLE d (dd TEXT) INHERITS (b,c,a); NOTICE: merging multiple inherited definitions of column "aa" NOTICE: merging multiple inherited definitions of column "aa" INSERT INTO a(aa) VALUES('aaa'); INSERT INTO a(aa) VALUES('aaaa'); INSERT INTO a(aa) VALUES('aaaaa'); INSERT INTO a(aa) VALUES('aaaaaa'); INSERT INTO a(aa) VALUES('aaaaaaa'); INSERT INTO a(aa) VALUES('aaaaaaaa'); INSERT INTO b(aa) VALUES('bbb'); INSERT INTO b(aa) VALUES('bbbb'); INSERT INTO b(aa) VALUES('bbbbb'); INSERT INTO b(aa) VALUES('bbbbbb'); INSERT INTO b(aa) VALUES('bbbbbbb'); INSERT INTO b(aa) VALUES('bbbbbbbb'); INSERT INTO c(aa) VALUES('ccc'); INSERT INTO c(aa) VALUES('cccc'); INSERT INTO c(aa) VALUES('ccccc'); INSERT INTO c(aa) VALUES('cccccc'); INSERT INTO c(aa) VALUES('ccccccc'); INSERT INTO c(aa) VALUES('cccccccc'); INSERT INTO d(aa) VALUES('ddd'); INSERT INTO d(aa) VALUES('dddd'); INSERT INTO d(aa) VALUES('ddddd'); INSERT INTO d(aa) VALUES('dddddd'); INSERT INTO d(aa) VALUES('ddddddd'); INSERT INTO d(aa) VALUES('dddddddd'); SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+---------- a | aaa a | aaaa a | aaaaa a | aaaaaa a | aaaaaaa a | aaaaaaaa b | bbb b | bbbb b | bbbbb b | bbbbbb b | bbbbbbb b | bbbbbbbb c | ccc c | cccc c | ccccc c | cccccc c | ccccccc c | cccccccc d | ddd d | dddd d | ddddd d | dddddd d | ddddddd d | dddddddd (24 rows) SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+----------+---- b | bbb | b | bbbb | b | bbbbb | b | bbbbbb | b | bbbbbbb | b | bbbbbbbb | d | ddd | d | dddd | d | ddddd | d | dddddd | d | ddddddd | d | dddddddd | (12 rows) SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----------+---- c | ccc | c | cccc | c | ccccc | c | cccccc | c | ccccccc | c | cccccccc | d | ddd | d | dddd | d | ddddd | d | dddddd | d | ddddddd | d | dddddddd | (12 rows) SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+----------+----+----+---- d | ddd | | | d | dddd | | | d | ddddd | | | d | dddddd | | | d | ddddddd | | | d | dddddddd | | | (6 rows) SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+---------- a | aaa a | aaaa a | aaaaa a | aaaaaa a | aaaaaaa a | aaaaaaaa (6 rows) SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+----------+---- b | bbb | b | bbbb | b | bbbbb | b | bbbbbb | b | bbbbbbb | b | bbbbbbbb | (6 rows) SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----------+---- c | ccc | c | cccc | c | ccccc | c | cccccc | c | ccccccc | c | cccccccc | (6 rows) SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+----------+----+----+---- d | ddd | | | d | dddd | | | d | ddddd | | | d | dddddd | | | d | ddddddd | | | d | dddddddd | | | (6 rows) UPDATE a SET aa='zzzz' WHERE aa='aaaa'; UPDATE ONLY a SET aa='zzzzz' WHERE aa='aaaaa'; UPDATE b SET aa='zzz' WHERE aa='aaa'; UPDATE ONLY b SET aa='zzz' WHERE aa='aaa'; UPDATE a SET aa='zzzzzz' WHERE aa LIKE 'aaa%'; SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+---------- a | zzzz a | zzzzz a | zzzzzz a | zzzzzz a | zzzzzz a | zzzzzz b | bbb b | bbbb b | bbbbb b | bbbbbb b | bbbbbbb b | bbbbbbbb c | ccc c | cccc c | ccccc c | cccccc c | ccccccc c | cccccccc d | ddd d | dddd d | ddddd d | dddddd d | ddddddd d | dddddddd (24 rows) SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+----------+---- b | bbb | b | bbbb | b | bbbbb | b | bbbbbb | b | bbbbbbb | b | bbbbbbbb | d | ddd | d | dddd | d | ddddd | d | dddddd | d | ddddddd | d | dddddddd | (12 rows) SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----------+---- c | ccc | c | cccc | c | ccccc | c | cccccc | c | ccccccc | c | cccccccc | d | ddd | d | dddd | d | ddddd | d | dddddd | d | ddddddd | d | dddddddd | (12 rows) SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+----------+----+----+---- d | ddd | | | d | dddd | | | d | ddddd | | | d | dddddd | | | d | ddddddd | | | d | dddddddd | | | (6 rows) SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+-------- a | zzzz a | zzzzz a | zzzzzz a | zzzzzz a | zzzzzz a | zzzzzz (6 rows) SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+----------+---- b | bbb | b | bbbb | b | bbbbb | b | bbbbbb | b | bbbbbbb | b | bbbbbbbb | (6 rows) SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----------+---- c | ccc | c | cccc | c | ccccc | c | cccccc | c | ccccccc | c | cccccccc | (6 rows) SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+----------+----+----+---- d | ddd | | | d | dddd | | | d | ddddd | | | d | dddddd | | | d | ddddddd | | | d | dddddddd | | | (6 rows) UPDATE b SET aa='new'; SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+---------- a | zzzz a | zzzzz a | zzzzzz a | zzzzzz a | zzzzzz a | zzzzzz b | new b | new b | new b | new b | new b | new c | ccc c | cccc c | ccccc c | cccccc c | ccccccc c | cccccccc d | new d | new d | new d | new d | new d | new (24 rows) SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+-----+---- b | new | b | new | b | new | b | new | b | new | b | new | d | new | d | new | d | new | d | new | d | new | d | new | (12 rows) SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----------+---- c | ccc | c | cccc | c | ccccc | c | cccccc | c | ccccccc | c | cccccccc | d | new | d | new | d | new | d | new | d | new | d | new | (12 rows) SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+-----+----+----+---- d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | (6 rows) SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+-------- a | zzzz a | zzzzz a | zzzzzz a | zzzzzz a | zzzzzz a | zzzzzz (6 rows) SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+-----+---- b | new | b | new | b | new | b | new | b | new | b | new | (6 rows) SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----------+---- c | ccc | c | cccc | c | ccccc | c | cccccc | c | ccccccc | c | cccccccc | (6 rows) SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+-----+----+----+---- d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | (6 rows) UPDATE a SET aa='new'; DELETE FROM ONLY c WHERE aa='new'; SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+----- a | new a | new a | new a | new a | new a | new b | new b | new b | new b | new b | new b | new d | new d | new d | new d | new d | new d | new (18 rows) SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+-----+---- b | new | b | new | b | new | b | new | b | new | b | new | d | new | d | new | d | new | d | new | d | new | d | new | (12 rows) SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+-----+---- d | new | d | new | d | new | d | new | d | new | d | new | (6 rows) SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+-----+----+----+---- d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | (6 rows) SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+----- a | new a | new a | new a | new a | new a | new (6 rows) SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+-----+---- b | new | b | new | b | new | b | new | b | new | b | new | (6 rows) SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----+---- (0 rows) SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+-----+----+----+---- d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | (6 rows) DELETE FROM a; SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+---- (0 rows) SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+----+---- (0 rows) SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----+---- (0 rows) SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+----+----+----+---- (0 rows) SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+---- (0 rows) SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+----+---- (0 rows) SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----+---- (0 rows) SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+----+----+----+---- (0 rows) -- Confirm PRIMARY KEY adds NOT NULL constraint to child table CREATE TEMP TABLE z (b TEXT, PRIMARY KEY(aa, b)) inherits (a); NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "z_pkey" for table "z" INSERT INTO z VALUES (NULL, 'text'); -- should fail ERROR: null value in column "aa" violates not-null constraint -- Check UPDATE with inherited target and an inherited source table create temp table foo(f1 int, f2 int); create temp table foo2(f3 int) inherits (foo); create temp table bar(f1 int, f2 int); create temp table bar2(f3 int) inherits (bar); insert into foo values(1,1); insert into foo values(3,3); insert into foo2 values(2,2,2); insert into foo2 values(3,3,3); insert into bar values(1,1); insert into bar values(2,2); insert into bar values(3,3); insert into bar values(4,4); insert into bar2 values(1,1,1); insert into bar2 values(2,2,2); insert into bar2 values(3,3,3); insert into bar2 values(4,4,4); update bar set f2 = f2 + 100 where f1 in (select f1 from foo); SELECT relname, bar.* FROM bar, pg_class where bar.tableoid = pg_class.oid order by 1,2; relname | f1 | f2 ---------+----+----- bar | 1 | 101 bar | 2 | 102 bar | 3 | 103 bar | 4 | 4 bar2 | 1 | 101 bar2 | 2 | 102 bar2 | 3 | 103 bar2 | 4 | 4 (8 rows) /* Test inheritance of structure (LIKE) */ CREATE TABLE inhx (xx text DEFAULT 'text'); /* * Test double inheritance * * Ensure that defaults are NOT included unless * INCLUDING DEFAULTS is specified */ CREATE TABLE inhe (ee text, LIKE inhx) inherits (b); INSERT INTO inhe VALUES ('ee-col1', 'ee-col2', DEFAULT, 'ee-col4'); SELECT * FROM inhe; /* Columns aa, bb, xx value NULL, ee */ aa | bb | ee | xx ---------+---------+----+--------- ee-col1 | ee-col2 | | ee-col4 (1 row) SELECT * FROM inhx; /* Empty set since LIKE inherits structure only */ xx ---- (0 rows) SELECT * FROM b; /* Has ee entry */ aa | bb ---------+--------- ee-col1 | ee-col2 (1 row) SELECT * FROM a; /* Has ee entry */ aa --------- ee-col1 (1 row) CREATE TABLE inhf (LIKE inhx, LIKE inhx); /* Throw error */ ERROR: column "xx" duplicated CREATE TABLE inhf (LIKE inhx INCLUDING DEFAULTS); INSERT INTO inhf DEFAULT VALUES; SELECT * FROM inhf; /* Single entry with value 'text' */ xx ------ text (1 row) -- Test changing the type of inherited columns insert into d values('test','one','two','three'); alter table a alter column aa type integer using bit_length(aa); select * from d; aa | bb | cc | dd ----+-----+-----+------- 32 | one | two | three (1 row) -- Tests for casting between the rowtypes of parent and child -- tables. See the pgsql-hackers thread beginning Dec. 4/04 create table base (i integer); create table derived () inherits (base); insert into derived (i) values (0); select derived::base from derived; derived --------- (0) (1 row) drop table derived; drop table base; create table p1(ff1 int); create table p2(f1 text); create function p2text(p2) returns text as 'select $1.f1' language sql; create table c1(f3 int) inherits(p1,p2); insert into c1 values(123456789, 'hi', 42); select p2text(c1.*) from c1; p2text -------- hi (1 row) drop function p2text(p2); drop table c1; drop table p2; drop table p1;