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Home/ Questions/Q 6547711
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Editorial Team
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Editorial Team
Asked: May 25, 20262026-05-25T11:51:52+00:00 2026-05-25T11:51:52+00:00

Doing a little garbage collection here and using a subquery, which I know isn’t

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Doing a little garbage collection here and using a subquery, which I know isn’t very efficient. Any pointers?

DELETE FROM `carts` WHERE `id` NOT IN (SELECT `cart_id` FROM `sessions`)

Basically it’s supposed to delete all records from my carts table that don’t have a corresponding record in the sessions table.

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  1. Editorial Team
    Editorial Team
    2026-05-25T11:51:52+00:00Added an answer on May 25, 2026 at 11:51 am
    DELETE FROM `carts` c 
    left outer join `sessions` s on (s.`cart_id` = c.`id`)
    WHERE s.`cart_id` is null
    
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