[R] Help to check data before putting it in a database

[Ulisses.Camargo]

The example scene:

I have a database with stats about each goal made by my soccer team. This
database (a data frame in R) is organized in lines (goals) with a set of
columns containing data about these goals (player name, tactic position,
etc). For now, this database will be called "data.frame1".

What I need is to feed this "data.frame1" with new information about my team
goals. I will call this new information "data.frame2". This set of new goals
is organized in the same way as in "data.frame1" (equal numbers of cols).

Where help is needed:

I need help in finding a way to check the player-name column in
"data.frame2" before feeding "data.frame1" with it. What I need is a way to
verify the name of the player on each line of "data.frame2" with the names
of players that already exist on a col in "data.frame1". Moreover, I need R
to make two main things:

First, the lines of “data.frame2” with player names that already exists in
“data.frame1” must be added to “data.frame1”.

Second: lines of “data.frame2” with player names that does not exist on
“data.frame1” must be listed in an output to be manually checked and
corrected. 
After this verification, corrected lines and new-player-names lines must be
incorporated in "data.frame1". 

What I want is to guarantee that will be no lines with wrong player names in
my database. 
At the same time, my script must permit new information to be added (new
player names).
 
Is there somebody who could help me with this?

Thanks for your attention

Best wishes
Ulisses   

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