mysql - delete data from database where date ... SQL -

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मैं डेटाबेस से कुछ डेटा हटाना चाहता हूं: 

  WHERE created_at & lt; 30 मिनट में    > 
 पुरानी तिथि की गणना करें और इसके साथ तुलना करें:  
  WHERE बनाया_ट & lt; अब () - इंटरवल 30 मिनिट  
 
 सभी उपलब्ध इकाइयों की सूची के लिए देखें।

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