MySQL Forums
Forum List  »  Newbie

Re: Copying a SUM Value
Posted by: Phillip Ward
Date: March 01, 2023 09:23AM


The act of copying to all rows may seem useless to you ...

"Useless" never crossed my mind.
"Inefficient" and "Slow" did, though.

This will work just fine for a table with a few rows, but try it with a real table of millions of rows. Your Application's performance will go through the floor.
Updating rows is [relatively] slow. It always involves writes to disk, if only to the Transaction [binary] log and that's Orders of Magnitude slower than reading stuff.

But, as I said, YMMV.

Regards, Phill W.

Options: ReplyQuote

Written By
February 27, 2023 02:29PM
February 27, 2023 03:23PM
February 27, 2023 03:53PM
February 27, 2023 04:06PM
February 27, 2023 06:00PM
February 27, 2023 07:12PM
February 28, 2023 05:44AM
February 28, 2023 10:08AM
Re: Copying a SUM Value
March 01, 2023 09:23AM
March 01, 2023 09:34AM
March 02, 2023 05:28AM
March 02, 2023 01:43PM

Sorry, only registered users may post in this forum.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.