mysql - Sql select query help needed -

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मेरे पास मेरे टेबल पर तालिका तालिका है: 

  यूज़रनेशन नाम varchar (16) नहीं नल परिचय_वन varchar (16) NULL   
 मेरे पास डेटा की 3 पंक्तियों का पालन करें: 
  
  यूज़रनेम Introduce_van Test1 NullL Test2 Test1 Test3 NULL   
 अब मैं सभी उपयोगकर्ता नामों को परिचयबेस में नहीं है और परिचय I_Van का मान नल है।  
 मैंने इसे इस एसक्यूएल के साथ करने की कोशिश की:  
  उपयोगकर्ता नाम से चुनें उपयोगकर्ता नाम जहां उपयोगकर्ता नाम नहीं है (SELECT introdu_van FROM anmeldelden WHERE introduce_van! = 'NULL')   
 यह क्वेरी देता है:  
 इसलिए मैंने सोचा कि अगर मैं जोड़ूंगा:  
  और introduce_van = 'null'     
 P> यह सिर्फ टेस्ट 3 लौटाएगा।  
 लेकिन यह 0 पंक्तियों को लौटाता है।  
 मुझे यह पता नहीं लगा कि कैसे मेरी चुनिंदा क्वेरी को ठीक करने के लिए यह सुनिश्चित करता है कि यह केवल टेस्ट 3 (न Introduce_van में और Introduce_van NULL होने में।  
 ओमेओन इस प्रश्न से मेरी मदद कर सकता है?   
 
 
 क्या आपका मतलब है "अब मैं सभी उपयोगकर्ता नाम चुनना चाहता हूँ Introduce_van   या   में परिचय के_वेन का मूल्य नल है। "???  
 यदि ऐसा है, तो इसका प्रयोग करें:  
  एक विशिष्ट उपयोगकर्ता नाम से चुनें WHERE परिचय_वन है नल या मौजूद नहीं है (चयन करें * FROM AAMMeldingen WHERE परिचय_अन = a.userName)

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