sql - nvl with query inside -

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इसके जैसा कुछ करना संभव है: 

  और zmt.mediatypeid nvl (: P21_MEDIA, zbx.media_type से mediatypeid चुनें)   
: P21_MEDIA एक चर   
 
 
 हाँ, आप हालत की जांच के लिए केस स्टेटमेंट का उपयोग कर सकते हैं:  
  और 1 = मामला कब: P21_MEDIA नहीं है तो मामला जब zmt.mediatypeid =: P21_MEDIA THEN 1 ELSE 0 END जब zmt.mediatypeid IN (zbx.media_type से mediatypeid चुनें) तब 1 ELSE 0 END

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