從兩個表中選擇並按兩個表中的公共列日期分組

Question

伙計們，我尋找了解決方案，但無法解決我的問題，如果有人能幫助我，我將不勝感激我有三個表term1 ， term2 ， term3 ，它們具有相同的列Adm ， date ， amountneeded ， amountpaid ，日期格式為yyyy-mm-dd我需要從三個表中檢索total amountpaid的total amountpaid year group

結果應該是

year    total
2012    323000
2013    423000

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Answer 1

試試這個

select tyear,sum(total)
from (
      select DATEPART(yyyy,date) as tyear ,sum(amountpaid) as total
      from  term1
      group by DATEPART(yyyy,date)
      union all
      select  DATEPART(yyyy,date) as tyear ,sum(amountpaid) as total
      from  term2
      group by DATEPART(yyyy,date)
      union all
      select  DATEPART(yyyy,date) as tyear ,sum(amountpaid) as total
      from  term1
      group by DATEPART(yyyy,date)
   )a group by tyear

Answer 2

select tyear,sum(total) from ( select EXTRACT(YEAR FROM date) as tyear ,sum(amountpaid) as total from term1 group by tyear union all select EXTRACT(YEAR FROM date) as tyear ,sum(amountpaid) as total from term2 group by tyear union all select EXTRACT(YEAR FROM date) as tyear ,sum(amountpaid) as total from term1 group by tyear )a group by tyear