SQL Procedure (Sybase Advantage Database Server) - sql

Question

I have table contain below data:
EMPCODE PAYCODE AMOUNT
------------------------
001 A 100
001 B 200
002 A 120
002 C 80
003 B 50
003 D 20
All PAYCODE in table at the moment are A, B, C, D.
However, other EMPCODE with other new PAYCODE such as E or F, might be added in later on.
EMPCODE 001 has PAYCODE A and B (he doesn't have PAYCODE C and D).
EMPCODE 002 has PAYCODE A and C (he doesn't have PAYCODE B and D).
EMPCODE 003 has PAYCODE B and D (he doesn't have PAYCODE A and C).
I want to create a simple stored procedure / SQL which can add the dummy records for each EMPCODE for PAYCODE which they don't own.
My expected result as below:
EMPCODE PAYCODE AMOUNT
------------------------
001 A 100
001 B 200
001 C 0
001 D 0
002 A 120
002 B 0
002 C 80
002 D 0
003 A 0
003 B 50
003 C 0
003 D 20
I can achieve that through coding but I need to do it via a stored procedure.
Is there any SQL stored procedure to achieve this?
Appreciate for the answer.

Answer 1

Use Join to get the result. SQLFiddle
SELECT C.EMPCODE, C.PAYCODE, ISNULL(D.AMOUNT, 0) AS AMOUNT FROM
(
SELECT * FROM
(SELECT EMPcode from Test GROUP BY EMPCODE) AS A,
(SELECT Paycode FROM Test GROUP BY PAYCODE) AS B
) AS C
LEFT JOIN Test AS D
ON C.EMPCODE=D.EMPCODE AND C.PAYCODE = D.PAYCODE
UPDATE:
1) To get the distinct EMPCODE from table
(SELECT EMPcode from Test GROUP BY EMPCODE) AS A
2) To get the distinct PAYCODE from table
(SELECT Paycode FROM Test GROUP BY PAYCODE) AS B
3) To get the all PAYCODE value for each Empcode.
SELECT * FROM
(SELECT EMPcode from Test GROUP BY EMPCODE) AS A,
(SELECT Paycode FROM Test GROUP BY PAYCODE) AS B

Answer 2

You can do this by generating all the combinations of empcode and paycode using a cross join in a sub-query that you then use as a derived table for a left join. To not insert already existing rows you should exclude them using a correlated not exists predicate. Written as a stored procedure it could look like this:
create proc insert_missing_values as
insert your_table (empcode, paycode, amount)
select distinct codes.empcode, codes.paycode, isnull(your_table.amount, 0) amount
from (
select t1.empcode, t2.paycode
from your_table t1, your_table t2
group by t1.empcode, t2.paycode
) codes
left join your_table on
codes.empcode = your_table.empcode
and
codes.paycode = your_table.paycode
where not exists (
select 1 from your_table
where codes.empcode = your_table.empcode and codes.paycode = your_table.paycode
)
Sample SQL Fiddle
Edit: as Sybase ASE doesn't support the explicit cross join you can use a unqualified implicit join with the same effect by doing from TableA, TableB which returns the Cartesian product of rows. See this Wikipedia article for an explanation.