Join performance: single on string or double on integers?

[imark]

I am afraid this was discussed before, but unfortunately what is being discussed here and here is beyond my level of understanding.

My issue: I need to join two tables during script execution, the row count is in the millions, so any performance improvement is welcome. I currently join on a string field that is the concatenation of two integer fields, '00_12345' = '00_12345'. 

Since the tables also have the original fields I was wondering whether a double join on 00 = 00 and 12345 = 12345 would reduce script runtime.

Thank you,

Igor

[daanciorea]

Hi,

I just testing your question and I can check that the join on double integers is better than string.

I attach a .qvw file. In script editor you can test this.

I hope it is useful for you.

Dan.