syntax - What does :: do in PostgreSQL? -

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इस सवाल का पहले से ही एक उत्तर है: < / P>

  • 3 जवाब

    मैंने देखा है :: पोस्टग्रेज़ कोड से जुड़े विभिन्न स्थानों में मैंने नेट पर देखा है उदाहरण के लिए: 

      SELECT '{apple, cherry apple, avocado}' :: पाठ [];   
     ऐसा लगता है कि कुछ प्रकार की कलाकारियां हैं  ::  पोस्टग्रेज़ में वास्तव में क्या है और इसका उपयोग कब किया जाना चाहिए?  
     मैंने थोड़ा सा गुगलिंग करने की कोशिश की और  ::  के लिए पोस्टग्रेज़ डॉक्स की खोज की लेकिन कोई अच्छा परिणाम नहीं मिला। 
     मैंने Google पर निम्न खोजों की कोशिश की:  
       
    •  पोस्टग्रेस डबल कॉलन  
    •  पोस्टग्रेज़ ::  
    •  ::   
       मैंने निम्नलिखित खोजों को पोस्टग्रे डॉक्स खोज बटन में देखा है  
         
      •  डबल बृहदान्त्र  
      •  डबल कॉलन कास्ट  
      •  ::   
         यह SO पर पूछने के लिए लगभग शर्मनाक था, लेकिन मुझे लगा कि Google भविष्य में अन्य लोगों के लिए यह जवाब उम्मीद करेगा।   
         
         
         PostgreSQL दो प्रकार की कंटैक्स को स्वीकार करता है, पोस्टग्रेएसक्यूएल-विशिष्ट <कोड > मान :: प्रकार  और SQL- मानक  CAST (मान एएस प्रकार) ।  
         इस विशिष्ट मामले में,  '{सेब, चेरी सेब, एवोकैडो}': पाठ [];  स्ट्रिंग को शाब्दिक  {सेब, चेरी सेब, एवोकैडो} लेता है  और यह   टेक्स्ट   के रूप में व्याख्या करने के लिए PostgreSQL को बताता है।  
         दस्तावेज को और विवरण के लिए देखें।  < / div>

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