Join performance: single on string or double on integers?

imark — Sat, 16 Nov 2024 20:55:29 GMT

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

Re: Join performance: single on string or double on integers?

daanciorea — Tue, 07 May 2019 11:12:51 GMT

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.

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Join performance: single on string or double on integers?

Re: Join performance: single on string or double on integers?