insert into T_pkey1 values (1, 'key1-1', 'test key');
insert into T_pkey1 values (1, 'key1-2', 'test key');
insert into T_pkey1 values (1, 'key1-3', 'test key');
insert into T_pkey1 values (2, 'key2-1', 'test key');
insert into T_pkey1 values (2, 'key2-2', 'test key');
insert into T_pkey1 values (2, 'key2-3', 'test key');
insert into T_pkey2 values (1, 'key1-1', 'test key');
insert into T_pkey2 values (1, 'key1-2', 'test key');
insert into T_pkey2 values (1, 'key1-3', 'test key');
insert into T_pkey2 values (2, 'key2-1', 'test key');
insert into T_pkey2 values (2, 'key2-2', 'test key');
insert into T_pkey2 values (2, 'key2-3', 'test key');
select * from T_pkey1;
 key1 |  key2  |   txt    
------+--------+----------
    1 | key1-1 | test key
    1 | key1-2 | test key
    1 | key1-3 | test key
    2 | key2-1 | test key
    2 | key2-2 | test key
    2 | key2-3 | test key
(6 rows)

select * from T_pkey2;
 key1 |  key2  |   txt    
------+--------+----------
    1 | KEY1-1 | test key
    1 | KEY1-2 | test key
    1 | KEY1-3 | test key
    2 | KEY2-1 | test key
    2 | KEY2-2 | test key
    2 | KEY2-3 | test key
(6 rows)

insert into T_pkey1 values (1, 'KEY1-3', 'should work');
insert into T_pkey2 values (1, 'KEY1-3', 'should fail');
ERROR:  duplicate key '1', 'KEY1-3' for T_pkey2
insert into T_dta1 values ('trec 1', 1, 'key1-1');
insert into T_dta1 values ('trec 2', 1, 'key1-2');
insert into T_dta1 values ('trec 3', 1, 'key1-3');
insert into T_dta1 values ('trec 4', 1, 'key1-4');
ERROR:  key for t_dta1 not in t_pkey1
insert into T_dta2 values ('trec 1', 1, 'KEY1-1');
insert into T_dta2 values ('trec 2', 1, 'KEY1-2');
insert into T_dta2 values ('trec 3', 1, 'KEY1-3');
insert into T_dta2 values ('trec 4', 1, 'KEY1-4');
ERROR:  key for t_dta2 not in t_pkey2
select * from T_dta1;
  tkey  | ref1 |  ref2  
--------+------+--------
 trec 1 |    1 | key1-1
 trec 2 |    1 | key1-2
 trec 3 |    1 | key1-3
(3 rows)

select * from T_dta2;
  tkey  | ref1 |  ref2  
--------+------+--------
 trec 1 |    1 | KEY1-1
 trec 2 |    1 | KEY1-2
 trec 3 |    1 | KEY1-3
(3 rows)

update T_pkey1 set key2 = 'key2-9' where key1 = 2 and key2 = 'key2-1';
update T_pkey1 set key2 = 'key1-9' where key1 = 1 and key2 = 'key1-1';
ERROR:  key '1', 'key1-1' referenced by T_dta1
delete from T_pkey1 where key1 = 2 and key2 = 'key2-2';
delete from T_pkey1 where key1 = 1 and key2 = 'key1-2';
ERROR:  key '1', 'key1-2' referenced by T_dta1
update T_pkey2 set key2 = 'KEY2-9' where key1 = 2 and key2 = 'KEY2-1';
update T_pkey2 set key2 = 'KEY1-9' where key1 = 1 and key2 = 'KEY1-1';
NOTICE:  updated 1 entries in T_dta2 for new key in T_pkey2
delete from T_pkey2 where key1 = 2 and key2 = 'KEY2-2';
delete from T_pkey2 where key1 = 1 and key2 = 'KEY1-2';
NOTICE:  deleted 1 entries from T_dta2
select * from T_pkey1;
 key1 |  key2  |     txt     
------+--------+-------------
    1 | key1-1 | test key
    1 | key1-2 | test key
    1 | key1-3 | test key
    2 | key2-3 | test key
    1 | KEY1-3 | should work
    2 | key2-9 | test key
(6 rows)

select * from T_pkey2;
 key1 |  key2  |   txt    
------+--------+----------
    1 | KEY1-3 | test key
    2 | KEY2-3 | test key
    2 | KEY2-9 | test key
    1 | KEY1-9 | test key
(4 rows)

select * from T_dta1;
  tkey  | ref1 |  ref2  
--------+------+--------
 trec 1 |    1 | key1-1
 trec 2 |    1 | key1-2
 trec 3 |    1 | key1-3
(3 rows)

select * from T_dta2;
  tkey  | ref1 |  ref2  
--------+------+--------
 trec 3 |    1 | KEY1-3
 trec 1 |    1 | KEY1-9
(2 rows)

select ruby_avg(key1) from T_pkey1;
 ruby_avg 
----------
        1
(1 row)

select ruby_sum(key1) from T_pkey1;
 ruby_sum 
----------
        8
(1 row)

select ruby_avg(key1) from T_pkey2;
 ruby_avg 
----------
        1
(1 row)

select ruby_sum(key1) from T_pkey2;
 ruby_sum 
----------
        6
(1 row)

select ruby_avg(key1) from T_pkey1 where key1 = 99;
 ruby_avg 
----------
         
(1 row)

select ruby_sum(key1) from T_pkey1 where key1 = 99;
 ruby_sum 
----------
        0
(1 row)

select 1 @< 2;
 ?column? 
----------
 t
(1 row)

select 100 @< 4;
 ?column? 
----------
 f
(1 row)

select * from T_pkey1 order by key1 using @<;
 key1 |  key2  |     txt     
------+--------+-------------
    1 | key1-1 | test key
    1 | key1-2 | test key
    1 | key1-3 | test key
    1 | KEY1-3 | should work
    2 | key2-3 | test key
    2 | key2-9 | test key
(6 rows)

select * from T_pkey2 order by key1 using @<;
 key1 |  key2  |   txt    
------+--------+----------
    1 | KEY1-3 | test key
    1 | KEY1-9 | test key
    2 | KEY2-3 | test key
    2 | KEY2-9 | test key
(4 rows)