Select Query with diagonally matching columns

Question

hi
the following is the table struncture and insert statements
create table emp_trans values (empno number , emptran_no number, prev_amount number, current_amount number)
insert into emp_trans values(102,109,0,20);
insert into emp_trans values(102,119,10,20);
insert into emp_trans values(102,129,20,30);
insert into emp_trans values(102,139,30,0);
insert into emp_trans  values(201,101,0,20);
insert into emp_trans values(201,110,20,30);
insert into emp_trans values(201,120,0,30);
insert into emp_trans values(201,130,30,20);
insert into emp_trans values(201,140,0,20);In the table we can see some mappings as follows
The data is on empno basis.
we have 2 employees with empno 201 and 102 . Each empno has different emptrans_no. Need not be in an sequence.
we need to select the set of records where prev_amount column matches with the current_amount column values for
the previous record for every individual empno.
prior to that the following basic select statement can be considered
select * from emp_trans  order by empno , emptran_nofor ex:
emp no 102 emptran_no 129 prev_amount column having values of 20 matches with the current_amount column having values 20
with emptran_no 119.
for empno 201 with emptran_no 110 we can see the prev_amount column having value 20 matched with current_account column havig values of 20
of previous emptran_no 101 for the same empno 201.
something like we need to see the diagnally mathced values.
Any help on such query most welcome.
Regards,

Answer 1

Hi,
sri wrote:
Hi
A small Change required
For empno 201 we need to display
EMPNO EMPTRAN_NO PREV_AMOUNT CURRENT_AMOUNT
102 129 20 30
102 139 30 0
201 *120* 20 30
201 130 30 20
rathe than
EMPNO EMPTRAN_NO PREV_AMOUNT CURRENT_AMOUNT
102 129 20 30
102 139 30 0
201 *110* 20 30
201 130 30 20Always explain how you get the results you want. Otherwise, the solution that works on your sample data won't necessarily work on your real data.
Given that the data for empno=201 is:
insert into emp_trans values (201, 101,  0, 20);
insert into emp_trans values (201, 110, 20, 30);
insert into emp_trans values (201, 120,  0, 30);
insert into emp_trans values (201, 130, 30, 20);
insert into emp_trans values (201, 140,  0, 20);Why do you want the row with emptrn_no=120, and not the row with emptran_no=110?
If you want the row with emptran_no=120, why don't you want the row with emptran_no=101?
If you want the row with emptran_no=130, why don't you want the row with emptran_no=110?
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