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Asked: 2026-06-17T18:11:46+00:00

My database has two columns : time and work. Its very very large and

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My database has two columns : time and work. Its very very large and still growing.

I want to select the last entry:

$sql = "SELECT time, work FROM device ORDER BY time DESC LIMIT 1"

It takes 1.5 seconds to response it. How can I speed this up?. Because I repeat it 20 times.

I can’t wait 20 seconds.

Greetings!

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1 Answer

  1. Editorial Team

    use MAX

    SELECT  *
FROM    tableName
WHERE   time = (SELECT MAX(time) FROM device)

    add also an Index on column time

    I was wondering why do you want to repeat this 20 times. If you are working on the application lebel, maybe you can add the result in a variable so you won’t execute it again.

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