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count by sql query or by php?


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i make i web site witharticles and comments . It will have a table comments with the article id.

Should i count the comments by a sql query or i should i put an extra field at the articles table with total comments number?

Thank you

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You should definitely do it in your query rather than on the PHP side.  By doing it on the PHP side, you are forcing mysql to prepare a stream with information that will never actually be retrieved, it will only be used with mysql_num_rows, which isn't cost effective.


If you are having performance issues, then I would suggest persisting the count, but up until then you should be fine with a COUNT(comment id), especially if indexed correctly.



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