In MySQL stored procedures check if a local variable is null -


निम्नलिखित उदाहरण संग्रहीत कार्यप्रणाली के साथ 

  डिसएलेर चर डायल; DECLARE Variable2 DOUBLE; कहीं से कहीं भी चुनें; कहीं से कुछ का चयन करेंअभियान 2 में पहले; चुनें (वैरिएबल + व्हेरिएबल 2);

यदि वैरिएबल या वेरिएबल 2 नल हैं तो अंतिम चयन शून्य पर लौटाएगा, मैं क्या चाहूंगा कि यदि वे रिक्त हैं तो उन्हें अंतिम चयन के पहले 0.00 में परिवर्तित किया जाना चाहिए, आप कैसे करें यह करो? मैंने पहले से ही जोड़ने की कोशिश की है 

  SELECT 0.00 में व्हेरिएबल जहां चर परिवर्तनीय है;

बस अंतिम चयन के बारे में, लेकिन वह काम नहीं कर रहा था 

  का चयन करें COALESCE (चर, 0) + COALESCE (variable2, 0)

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