sql - How to get the sum with NVL in oracle? -


Please help, I do not know how to get the sum of two data with the NVL function and display it as two results

desired output: 

  data, date, total number of G column, total number of U column

Here are some queries Is: 

  SELECT 'data' || ',' To_char (d.dtime_day, 'MM / dd / Yyyy')

- I want to get the amount of this part 

  || ',' || NVL (GPO, 0)  
  || '> NVL (g.office, 0)  
 
 - I want to get the sum of this part 
,' || NVL (U.P.O.SS., 0) || ',' NVL (U.Office, 0) to SwamyWHDC_Data D

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