1997-09-11 11:14:12 +02:00
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create table pkeys (pkey1 int4 not null, pkey2 text not null);
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create table fkeys (fkey1 int4, fkey2 text, fkey3 int);
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create table fkeys2 (fkey21 int4, fkey22 text, pkey23 int not null);
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create index fkeys_i on fkeys (fkey1, fkey2);
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create index fkeys2_i on fkeys2 (fkey21, fkey22);
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create index fkeys2p_i on fkeys2 (pkey23);
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insert into pkeys values (10, '1');
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insert into pkeys values (20, '2');
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insert into pkeys values (30, '3');
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insert into pkeys values (40, '4');
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insert into pkeys values (50, '5');
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insert into pkeys values (60, '6');
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create unique index pkeys_i on pkeys (pkey1, pkey2);
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--
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-- For fkeys:
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-- (fkey1, fkey2) --> pkeys (pkey1, pkey2)
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-- (fkey3) --> fkeys2 (pkey23)
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--
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create trigger check_fkeys_pkey_exist
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before insert or update on fkeys
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for each row
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execute procedure
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check_primary_key ('fkey1', 'fkey2', 'pkeys', 'pkey1', 'pkey2');
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create trigger check_fkeys_pkey2_exist
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before insert or update on fkeys
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for each row
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execute procedure check_primary_key ('fkey3', 'fkeys2', 'pkey23');
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--
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-- For fkeys2:
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-- (fkey21, fkey22) --> pkeys (pkey1, pkey2)
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--
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create trigger check_fkeys2_pkey_exist
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before insert or update on fkeys2
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for each row
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execute procedure
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check_primary_key ('fkey21', 'fkey22', 'pkeys', 'pkey1', 'pkey2');
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--
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-- For pkeys:
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-- ON DELETE/UPDATE (pkey1, pkey2) CASCADE:
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-- fkeys (fkey1, fkey2) and fkeys2 (fkey21, fkey22)
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--
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create trigger check_pkeys_fkey_cascade
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before delete or update on pkeys
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for each row
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execute procedure
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check_foreign_key (2, 'cascade', 'pkey1', 'pkey2',
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'fkeys', 'fkey1', 'fkey2', 'fkeys2', 'fkey21', 'fkey22');
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--
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-- For fkeys2:
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-- ON DELETE/UPDATE (pkey23) RESTRICT:
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-- fkeys (fkey3)
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--
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create trigger check_fkeys2_fkey_restrict
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before delete or update on fkeys2
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for each row
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execute procedure check_foreign_key (1, 'restrict', 'pkey23', 'fkeys', 'fkey3');
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insert into fkeys2 values (10, '1', 1);
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insert into fkeys2 values (30, '3', 2);
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insert into fkeys2 values (40, '4', 5);
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insert into fkeys2 values (50, '5', 3);
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-- no key in pkeys
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insert into fkeys2 values (70, '5', 3);
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insert into fkeys values (10, '1', 2);
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insert into fkeys values (30, '3', 3);
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insert into fkeys values (40, '4', 2);
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insert into fkeys values (50, '5', 2);
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-- no key in pkeys
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insert into fkeys values (70, '5', 1);
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-- no key in fkeys2
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insert into fkeys values (60, '6', 4);
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delete from pkeys where pkey1 = 30 and pkey2 = '3';
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delete from pkeys where pkey1 = 40 and pkey2 = '4';
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update pkeys set pkey1 = 7, pkey2 = '70' where pkey1 = 50 and pkey2 = '5';
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update pkeys set pkey1 = 7, pkey2 = '70' where pkey1 = 10 and pkey2 = '1';
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DROP TABLE pkeys;
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DROP TABLE fkeys;
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DROP TABLE fkeys2;
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create table dup17 (x int4);
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create trigger dup17_before
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before insert on dup17
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for each row
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execute procedure
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funny_dup17 ()
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;
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insert into dup17 values (17);
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select count(*) from dup17;
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insert into dup17 values (17);
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select count(*) from dup17;
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drop trigger dup17_before on dup17;
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create trigger dup17_after
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after insert on dup17
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for each row
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execute procedure
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funny_dup17 ()
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;
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insert into dup17 values (13);
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select count(*) from dup17 where x = 13;
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insert into dup17 values (13);
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select count(*) from dup17 where x = 13;
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DROP TABLE dup17;
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1997-09-24 10:36:47 +02:00
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create sequence ttdummy_seq increment 10 start 0 minvalue 0;
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create table tttest (
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price_id int4,
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price_val int4,
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price_on int4 default nextval('ttdummy_seq'),
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price_off int4 default 999999
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);
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insert into tttest values (1, 1, null, null);
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insert into tttest values (2, 2, null, null);
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insert into tttest values (3, 3, null, null);
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create trigger ttdummy
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before delete or update on tttest
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for each row
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execute procedure
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ttdummy (price_on, price_off);
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select * from tttest;
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delete from tttest where price_id = 2;
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select * from tttest;
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-- what do we see ?
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-- get current prices
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select * from tttest where price_off = 999999;
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-- change price for price_id == 3
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update tttest set price_val = 30 where price_id = 3;
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select * from tttest;
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-- now we want to change pric_id in ALL tuples
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-- this gets us not what we need
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update tttest set price_id = 5 where price_id = 3;
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select * from tttest;
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-- restore data as before last update:
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select set_ttdummy(0);
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delete from tttest where price_id = 5;
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update tttest set price_off = 999999 where price_val = 30;
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select * from tttest;
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-- and try change price_id now!
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update tttest set price_id = 5 where price_id = 3;
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select * from tttest;
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-- isn't it what we need ?
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select set_ttdummy(1);
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-- we want to correct some "date"
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update tttest set price_on = -1 where price_id = 1;
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-- but this doesn't work
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-- try in this way
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select set_ttdummy(0);
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update tttest set price_on = -1 where price_id = 1;
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select * from tttest;
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-- isn't it what we need ?
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-- get price for price_id == 5 as it was @ "date" 25
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select * from tttest where price_on <= 25 and price_off > 25 and price_id = 5;
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drop table tttest;
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drop sequence ttdummy_seq;
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