Как да използвам външен ключ в sqlite?

Както Selvin предложи да се използва при каскада за изтриване

http://www.sqlite.org/foreignkeys.html

Таблица 1

CREATE TABLE table1 (
  id PRIMARY KEY  
 ,entry1 text,entry2 text
);

След това

insert into table1 values(1,"aaaa","aaaaa");
insert into table1 values(2,"bbbb","bbbbb");

Таблица 2

CREATE TABLE table2(
  id int references table1(id) ON DELETE CASCADE, entryx text, constant text
);


insert into table2 values(1,"aaaa","aaaaa");
insert into table2 values(1," baaaa ","baaaaaaa");
insert into table2 values(1,"  caaaa ","caaaaaaa")
insert into table2 values(2,"bbbb","bbbbb"); 

Таблици след въвеждане

sqlite> select * from table1;
id          entry1      entry2    
----------  ----------  ----------
1           aaaa        aaaaa     
2           bbbb        bbbbb     
sqlite> select * from table2;
id          entryx      constant  
----------  ----------  ----------
1           aaaa        aaaaa      
1           baaaa       baaaaaaa  
1           caaaa       caaaaaaa  
2           bbbb        bbbbb  

Изтриване

sqlite> delete from table1 where id=1;

Таблици след изтриване

sqlite> select * from table2;
id          entryx      constant  
----------  ----------  ----------
2           bbbb        bbbbb     


sqlite> select * from table1;
id          entry1      entry2    
----------  ----------  ----------
2           bbbb        bbbbb