sql - MySQL SUM by if statement -

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मेरे पास MySQL तालिका में 3 कॉलम type , sum और custom_sum जहां custom_sum खाली हो सकता है, और मैं क्वेरी को संशोधित करने पर रोकता हूं 

  SELECT 'type`, SUM (`sum`) से` लोकलहोस्ट-परीक्षण' ग्रुप द्वारा `   
 मुझे  sum  में  SUM ()  का उपयोग करना है, अगर  custom_sum  खाली है , और अगर यह नहीं है तो  custom_sum  का उपयोग करें। क्या आईएससीएल में "if" स्टेटमेंट के आधार पर विभिन्न कॉलमों से योग करना संभव है?   
 
 
 अगर  कस्टम_सैम  मान  null :  
  चुनें "u.type", SUM (COALESCE (`custom_sum`,` sum`)) से `स्थानीयहोस्ट- यदि  custom_sum  मान है  खाली  ( == '' )   :  
  चुनें "यू.प्रकार", SUM (केस जब `कस्टम_सैम` = '' फिर 'योग' ELSE 'custom_sum' END)` लोकलहोस्ट-परीक्षण 'समूह से `प्रकार` < / कोड>

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