mysql - phpMyAdmin - #1267 - Illegal mix of collations for operation '<' -

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मुझे निम्न त्रुटि संदेश मिल रहा है: 

  SELECT * FROM Syshealth WHERE 'टाइमस्टैम्प' & lt; DATE_SUB (NOW (), INTERVAL 15 MINUTE)   
 मुझे निम्न त्रुटि मिल रही है:  
  # 1267 - collations के गैरकानूनी मिश्रण (utf8mb4_general_ci, COERCIBLE) और ऑपरेशन के लिए (लैटिन 1_स्विडिश_सी, NUMERIC) '& lt;'  utf8_unicode_ci    
 मैं पहले से ही कुछ लेख पढ़ चुके हैं, और मैंने सबसे ऊपर जवाब देने की कोशिश की है, लेकिन सफलता के बिना ...  
 कोई और विचार है?  
 संपादित करें: अतिरिक्त जानकारी - 'टाइमस्टैम्प' कॉलम प्रकार  दिनांक समय    / Div> 
 
 
 यदि आप एकल का उपयोग करते हैं, तो आपको कॉलम की पहचान करने के लिए `(बैटकिक) का उपयोग करना होगा, यह स्ट्रिंग शब्दशः के रूप में माना जाएगा  
  सिलेबल्ड से चयन करें WHERE 'टाइमस्टैम्प` & lt; DATE_SUB (NOW (), INTERVAL 15 MINUTE)

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