QlikView: Insert and update based on condition (without timestamp) - qlikview

Question

I have encountered a problem when I am trying to write a script to one version of Insert and Update Incremental Load.
Example: To simplify the example I have made an illustration of how I want the data-set to update. (I leave the code for the discussion)
Illustration:
In the example above, you can see that I both want insert new records and to update records. The condition is that I only want to update records if the new value is greater than the existing record.
For instance, the existing record for ID 2 equals to 0 (Table 1) and since the new record for ID 2 equals to 100 (Table 2) I want to Update that record so the final updated record for ID 2 equals to the highest value of them two (Updated Table). If Table 2 contains a new record I just want to add that record to the final data-set.
Description:
Insert new records
Update records if the value is higher than the existing record
What do you guys think is the best solution for this kind of problem?

Answer 1

Not sure it's the best solution
//QVD
Table:
LOAD * INLINE [
ID, Value, Source
1, 500, 'QVD'
2, 0, 'QVD'
3, 100, 'QVD'
4, 300, 'QVD'
5, 0, 'QVD'
];
//ODBC
Concatenate(Table)
LOAD * INLINE [
ID, Value, Source
2, 100, ODBC
3, 700, ODBC
4, 300, ODBC
6, 500, ODBC
7, 0, ODBC
];
NewTable:
LOAD
ID,
max(Value) as Value
Resident Table
Group by ID
;
drop Table Table;