Regarding "Update .. From Table" Statement

Hi,
I have an existing piece of code which I'm trying to understand.
There are two scenarios regarding the UPDATE statement.
1) Scenario 1:
There exists a database table with around 100 or more fields/columns [Eg: DB_TABLE1].
An Internal Table exists with the same key as the above database table [EG: I_TABLE1].
code:
loop at I_TABLE1.
update DB_TABLE1
set kf1 = I_TABLE1-kfa
   kf2 = I_TABLE1-kfb
   kf3 = I_TABLE1-kfc
   kf4 = I_TABLE1-kfd
where key1 = I_TABLE1-keya AND key2 = I_TABLE1-keyb.
Endloop.
In the above scenario the records in database table [DB_TABLE1] with matching condition are updated and the rest of the fields are not touched. - Correct me if I am wrong.
2) Scenario 2:
There exists a database table with around 100 or more fields/columns [Eg: DB_TABLE1].
Two Internal Tables exist with the same key as the above database table [EG: I_TABLE1 And I_TABLE2].
Code part a:
SELECT * FROM DB_TABLE1 INTO TABLE I_TABLE2
      WHERE KF1 <> 0.
Internal Table 1 has some data.
Code part b:
loop at I_TABLE1.
update DB_TABLE1
set kf1 = I_TABLE1-kfa
   kf2 = I_TABLE1-kfb
   kf3 = I_TABLE1-kfc
   kf4 = I_TABLE1-kfd
where key1 = I_TABLE1-keya AND key2 = I_TABLE1-keyb.
Endloop.
Code part c:
update DB_TABLE1 FROM TABLE I_TABLE2.
In the second scenario what will be the final effect of DB_TABLE1?
As i understand it, there is no use of Code part b. Am I right?
I thought that the records in I_TABLE2 with matching key in DB_TABLE1 will be updated and the rest of the records will be deleted.
But actually there is not change in the DB_TABLE1 when the above code is executed.
Help is appreciated.
Thanks.

Hi Joey,
Scenario 1: In the above scenario the records in database table DB_TABLE1 with matching condition are updated and the rest of the fields are not touched.
- That's right.
Scenario 2: As i understand it, there is no use of Code part b.
- Exactly because of the following reasons:
1. Code part a shows data selected from DB_TABLE1 INTO TABLE I_TABLE2.
2. Code part c shows DB_TABLE1 updated from TABLE I_TABLE2 whereas Code part b uses ONLY internal table I_TABLE1.
3. If there are any operations performed in Code Part b on 'I_TABLE2', then this would have been different.
Regards,
Pranav.

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