Reseting variables

Hello Dmitry and all MVD fans,

Second question of the day : I handle a lot of data from web pages. After cleaning the page source, I get a lot of data that I check against my database before saving, updating or discarding it.

In that process, after cleaning the webpage source code, I get a long StringList which is then split into an array and then, looping through the array, I send request to the database to check my data.

For each loop, the variables I use are the same (I mean same name), I would like to known what would be the correct way to reinitialize those variables at the begining of each loop.

For example :

sku_array := SplitString(cat_string,',');
     for i := 0 to Length(sku_array) - 1 do
          begin
               known_sku := SQLExecute('SELECT COUNT(id) FROM asset WHERE asset_sku = "'+sku_array[i]+'"');
                    if known_sku = 0 then .....
                                    begin
                                          ..... //some code
                                    end
                    if known_sku <> 0 then
                                    begin
                                          ..... //more awesome code
                                    end;

                    known_sku := NIL; //-----> reset the variable before new loop

          end;

Is it the correct way to reset a variable to make sure it is empty, or is there another / better way ?

Thanks in advance

Cheers

Mathias