Find out the data that is higher than 20 after deduction and delete it?


online

time() online 20

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id 2"s online_status deduction time () has been higher than 30, but id 1 does not have it, but it is still found out?

Mysqli php7 php sql-statement mysql
Mar.30,2021 
 

  DELETE FROM your_table WHERE online < NOW ()-20;  

For more precise deletion, add  where  condition 
 later.

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