Kettle consolidated record data reduction

There is such a problem in data consolidation today ： Consolidated record as 207 strip 、 Output is 206 strip

Refer to the Others' articles   Provide ending ideas

1. In operation db when , Control sequence , First delete, after insert, Such data will not be less
2. I guess , A modified data may be judged as new 、 modify 、 deleted , There is no fastest record to find in the old data source , Just mark it as new, Later, find a piece of data in the old data source , In the new data source （ The past data is not considered ） Can't find , Just mark it as deleted
So the solution is simple , Sort both old and new data sources , In this way, I get the result I want .

I made four attempts

1、 Change old and new data sources  

Will be new 、 Just change the old data source , Not solved .

2、 Change the field settings of consolidated records （ Combine the first success ）
    Add other filter conditions , Combine the first success .

3、 Merge records after sorting

  According to the field sClassCode After ordering , Instead, there are fewer 3 strip . Failure ~

4、 Add constant sequence

  After adding the constant sequence , No change .

 

The above four methods , It's hard to be single ,

Combining two or more can keep the amount of data unchanged .

I don't quite understand the specific principle , Please give advice or comments ~~~（c243126035）