sql - Delete duplicate column value from mysql -

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मेरे पास mysql तालिका ईमेल है जहां एकाधिक कॉलम जैसे 

  "प्रथम_नाम", "अंतिम_नाम", "ईमेल", "संपर्क"   
 इस तालिका में मेरे पास बहुत से ईमेल आईडी हैं  
 कृपया इस डाटा को अनन्य रूप में बनाना चाहते हैं, जहां अन्य पंक्ति में कोई भी ईमेल नहीं है।  
 कृपया इसके लिए एसक्यूएल क्वेरी लिखना कैसे साझा करें  
 धन्यवाद परस   
 
 
 पहले आपको निम्न क्वेरी का उपयोग करके डुप्लिकेट ईमेल की सूची ढूंढनी होगी।  
  ईमेल का चयन करें, सीएनटी   
 द्वारा ई-मेल ऑर्डर द्वारा ईमेल समूह के रूप में सीएनटी (*) के रूप में क्वेरी ईमेल और दोहराव की गिनती देगा। फिर उस रिकॉर्ड के आधार पर कौन सा रिकॉर्ड वैध है, हटाए जाने के कदम उठाएं।

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