postgresql - How to unnest an array for supply a sequence of arguments? -

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PostgreSQL 9.2 के साथ काम करता है, 

  SELECT प्रारूप ('% s% s!', 'नमस्ते दुनिया');   
 लेकिन मुझे  
  SELECT स्वरूप ('% s% s!', सरणी ['हैलो', 'विश्व']) की तरह कुछ चाहिए।   
 या, विशेष रूप से, मुझे कुछ  convertToArgs  की आवश्यकता है,  
  SELECT प्रारूप ('% s% s!', ConvertToArgs (सरणी ['हैलो', 'दुनिया']);   
 
 नोट: वास्तविक समस्या सामान्य है, किसी भी संख्या के साथ (सरणी और संगत प्लेसहोल्डर में)  
  चुनें प्रारूप (टेम्पलेट, कन्वर्टटॉअर्स (मान));    
 
 
 इस सुविधा को तर्क दिया जाता है।  
 आप कॉल कर सकते हैं  VARIADIC  कीवर्ड:  
  SELECT प्रारूप ('% s% s!', 'VARIADIC') में शामिल होने पर  VARIADIC  पैरामीटर भी, एक सरणी के साथ। ARRAY ['हैलो', 'विश्व']);   
  संपादित करें : जैसा कि बताया गया है, यह 9.2 में काम नहीं करेगा। इसलिए नहीं क्योंकि  VARIADIC  तर्क कॉल, और न ही  प्रारूप ()  असमर्थित है दस्तावेज़ के अनुसार  concat ,  concat_ws  और  प्रारूप  को इस तरह से नहीं कहा जा सकता (9.3 से पहले - तथ्य के बगल में, वह  pg_get_functiondef < / कोड> यह 9.2 में भी भिन्नतापूर्ण रिपोर्ट करता है) उपयोगकर्ता परिभाषित कार्य  सकते हैं  इस तरह 9.2 में भी कहा जा सकता है।

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