How to update column value dynamically

Question

Hi All,
I have created a simple mapping and selected insert/update on target table. In target table there is one column record_type which will hold either 'NEW' (if new record is inserting) or 'UPDATED'(if existing record is updating) value. Please let me know how can I do this using OWB PL/SQL map?
Thanks
Bhushan

Answer 1

Hi Sanjaya,
Thank you for your reply.
I like your approch but i think there is need to pass 'UPDATED' when intersect is being used and 'NEW' when minus is being used.
I have developed an OWB map as mentioned in below steps.
1. Chose source (TableA) and target (TableB) as source using table operator.
2. Joined TableA to TableB on col1 using left outer join using joined operator.
3. In expression operator I have calculated value for TableB.col3 using below logic.
CASE WHEN TableB.col1 IS NULL THEN 'NEW' ELSE 'UPDATED' END
4. Mapped columns from expression operator to target table.
I would like to know you comments on above approch. My OWB map has generated below merge statement.
MERGE INTO TableB
USING(SELECT MERGESQL.col1,MERGESQL.col2, CASE WHEN MERGESQL.col3 is null then 'NEW' else 'UPDATED' END col3
FROM (SELECT TableA.col1, TableA.col2,TableB.col1 AS col3
FROM TableA
LEFT OUTER JOIN TableB
ON (TableA.col1 = TableB.col1)) MERGESQL
ON (col1 = MERGESQL.col1)
WHEN NOT MATCHED THEN INSERT(col1,col2,col3) VALUES(MERGESQL.col1,MERGESQL.col2,MERGESQL.col3)
WHEN MATCHED THEN
UPDATE SET col2 = MERGESQL.col2,
col3 = MERGESQL.col3;