How to create the map that updates only the changed lines

Hello

I have a map that made a merger (update/insert) in a table. The problem is that it will always update all rows in this table. I want to update only the changed lines.

Some dummy code that shows what I want to do.
Current situation (all lines updated):

FUSION
IN
Table 1-t1
USING
(select key_column, Column1, Column2 from table2) t2
ON)
T1.key_column = t2.key_kolumn
)

WHEN MATCHED THEN
UPDATE
SET
T1. Column1 = t2.column1
T1. Column2 = t2.column2
WHEN NOT MATCHED THEN
INSERT
(t1.key_column, t1.column1, t1.column2)
VALUES
(t2.key_column, t2.column1, t2.column2);

What I'm trying to get (only changed the lines updated):
FUSION
IN
Table 1-t1
USING
(select key_column, Column1, Column2 from table2) t2
ON)
T1.key_column = t2.key_kolumn
)

WHEN MATCHED THEN
UPDATE
SET
T1. Column1 = t2.column1
T1. Column2 = t2.column2
* WHERE
T1. Column1! = t2.column1
or t1.column2! = t2.column2*
WHEN NOT MATCHED THEN
INSERT
(t1.key_column, t1.column1, t1.column2)
VALUES
(t2.key_column, t2.column1, t2.column2);

WHERE in WHEN MATCHED t clause is that I'm not able to create via OWB in the mapping. How is that possible?
I tried to look for the solution here and google without success

Thank you!

Hello

you left outer join table2, with table1. Then use a filter to determine which rows in which an attribute has changed or no towing in table1 where found.
To compare attributes use expression with nvl to properly handle nulls: nvl(table2.my_attribute,'#')! = nvl(table1.my_attribute,'#')

Kind regards
Carsten.

Tags: Business Intelligence

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