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Editorial Team
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Asked: 2026-05-20T14:56:43+00:00

I can get same result for these queries, but which one is the fastest,

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I can get same result for these queries, but which one is the fastest, and most efficient?

where in() or inner join?

SELECT `stats`.`userid`,`stats`.`sumpoint` 
FROM  `stats` 
INNER JOIN users
ON `stats`.`userid` = `users`.`userid` 
WHERE `users`.`nick` =  '$nick'

ORDER BY `statoylar`.`sumpoint` DESC  limit 0,10

and

SELECT `stats`.`userid`,`stats`.`sumpoint` 
FROM  `stats` 
WHERE userid
IN (
SELECT userid
FROM  `users` 
WHERE  `users`.`nick` =  '$nick'
)
ORDER BY `stats`.`sumpoint` DESC  limit 0,10
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1 Answer

  1. Editorial Team

    Depends on your SQL engine. Newer SQL systems that have reasonable query optimizers will most likely rewrite both queries to the same plan. Typically, a sub-query (your second query) is rewritten using a join (the first query).

    In simple SQL engines that may not have great query optimizers, the join should be faster because they may run sub-queries into a temporary in-memory table before running the outer query.

    In some SQL engines that have limited memory footprint, however, the sub-query may be faster because it doesn’t require joining — which produces more data.

    So, in summary, it depends.

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