縱錶轉橫表的”SQL”樣本:

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縱錶轉橫表的"SQL"樣本:
  縱表結構:
  
  fname ftype fvalue
  小喬 zaocan 10
  小喬 zhongcan 20
  小喬 wancan 5
  
  轉換後的表結構:
  
  fname zaocan_value zhongcan_value wancan_value
  小喬 10 20 5
  
  縱錶轉橫表SQL樣本:
  
  select Fname, sum(case Ftype when 'zaocan'
  then Fvalue else 0 end) as zaocan_value,
  sum(case Ftype when 'zhongcan'
  then Fvalue else 0 end) as zhongcan_value,
  sum(case Ftype when 'wancan' then Fvalue else 0 end)
  as wancan_value from case_table group by Fname

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