sql - Issue with CASE statement not giving correct value -

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मैं SQL डेवलपर में निम्नलिखित CASE कथन का उपयोग कर रहा हूं:
< P> मेरे परिणाम खाली हैं जब मुझे कम से कम N प्राप्त करना चाहिए।

यदि आप सभी चाहते हैं कि 'एन' प्राप्त करना है, जब आपकी अन्य स्थितियां पूरी नहीं होती हैं, तो आप ELSE कीवर्ड का प्रयोग कर सकते हैं: 

  मामला जब ([दवा] = "एन") और ([नाम] = "एसटीएमईएस") और ([मूल इकाइयों] रिक्त नहीं है) तब "वाई" जब ([दवा] = "एन") और ([नाम] = "स्टाइट्स") और ([मूल इकाइयों] नल है) तो "एन" जब ([दवा] = "वाई") और ([नाम] = "स्टाइट्स") और ([मूल इकाइयों] रिक्त नहीं है) तो "एन" जब ([दवा] = "वाई") और ([नाम] = "STYMES") और ([मूल इकाइयों] शून्य है) फिर "वाई" और "एन" एंड

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