Update on Parent Child

Question

how can we update both parent and child records in the query
thanks in advance

Answer 1

Mushy wrote:
... is there anyway to update both at a time means parent and child not to enter a new one in parent then update in child and then delete the old oneThat is possible if your foreign key constraint had been declared as an initially deferred one:
test@ORA10G>
test@ORA10G> --
test@ORA10G> drop table child;
Table dropped.
test@ORA10G> drop table parent;
Table dropped.
test@ORA10G>
test@ORA10G> create table parent (x number primary key, y varchar2(1), z date);
Table created.
test@ORA10G> insert into parent (x,y,z) values (1,'a',trunc(sysdate,'yyyy'));
1 row created.
test@ORA10G>
test@ORA10G> create table child (p number primary key, q number, r varchar2(1));
Table created.
test@ORA10G>
test@ORA10G>
test@ORA10G> alter table child add foreign key (q) references parent (x) initially deferred;
Table altered.
test@ORA10G>
test@ORA10G>
test@ORA10G> insert into child (p,q,r) values (10,1,'x');
1 row created.
test@ORA10G> commit;
Commit complete.
test@ORA10G>
test@ORA10G> --
test@ORA10G> select * from parent;
         X Y Z
         1 a 01-JAN-08
test@ORA10G> select * from child;
         P          Q R
        10          1 x
test@ORA10G>
test@ORA10G> -- update primary key value 1 to 2 in parent table
test@ORA10G>
test@ORA10G> -- (1) update parent table
test@ORA10G> update parent set x = 2;
1 row updated.
test@ORA10G>
test@ORA10G> -- (2) update the foreign key value in child table
test@ORA10G> update child set q = 2;
1 row updated.
test@ORA10G>
test@ORA10G> --
test@ORA10G> select * from parent;
         X Y Z
         2 a 01-JAN-08
test@ORA10G> select * from child;
         P          Q R
        10          2 x
test@ORA10G>
test@ORA10G>It goes without saying that you cannot have a commit in between.
Mushy wrote:
... is there anyway to update both at a time ...Umm... I do not know of any UPDATE statement that could be used to update two tables simultaneously.
isotope