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 tcl_avg(key1) from T_pkey1;
 tcl_avg 
---------
       1
(1 row)

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

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

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

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

select tcl_sum(key1) from T_pkey1 where key1 = 99;
 tcl_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 @<, key2;
 key1 |         key2         |                   txt                    
------+----------------------+------------------------------------------
    1 | KEY1-3               | should work                             
    1 | key1-1               | test key                                
    1 | key1-2               | test key                                
    1 | key1-3               | test key                                
    2 | key2-3               | test key                                
    2 | key2-9               | test key                                
(6 rows)

select * from T_pkey2 order by key1 using @<, key2;
 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)

