Hello Friends, Help Needed in Query

Question

Hi,
I have a table with the structure
SELECT * FROM PR_TST
ID PRS_ID
16 - 8
17 - 9
18 - 10
20 - 10
23 - 5
25 - 5
28 - 30
30 - 32
SELECT * FROM PR_PRS_TST
PRS_ID - PRS_WT
8 - 8
9 - 9
10 - 10
5 - 12
30 - 19
32 - 17
Now i want to add a new field in the Table PR_TST and want to update the prs_wt for the corresponding prs_id.
Is this possible in a single update statement without using a for loop statement.
Thanks,
Dick

Answer 1

Is this what you are looking for?
create table pr_tst
(ID int
,PRS_ID int
, y int);
insert into pr_tst values (16 , 8 , null);
insert into pr_tst values (17 , 9 , null);
insert into pr_tst values (18 , 10, null);
insert into pr_tst values (20 , 10, null);
insert into pr_tst values (23 , 5 , null);
insert into pr_tst values (25 , 5 , null);
insert into pr_tst values (28 , 30, null);
insert into pr_tst values (30 , 32, null);
create table PR_PRS_TST
(PRS_ID int
, PRS_WT int)
insert into pr_prs_tst values (8 , 8  );
insert into pr_prs_tst values (9 , 9  );
insert into pr_prs_tst values (10 , 10);
insert into pr_prs_tst values (5 , 12 );
insert into pr_prs_tst values (30 , 19);
insert into pr_prs_tst values (32 , 17);
commit;
update pr_tst t
   set t.y = (select x.prs_wt
              from pr_prs_tst x
             where x.prs_id = t.prs_id
select *
  from pr_tst
ID PRS_ID Y
16  8  8
17  9  9
18 10 10
20 10 10
23  5 12
25  5 12
28 30 19
30 32 17