从两个表中选择并按两个表中的公共列日期分组

Question

伙计们，我寻找了解决方案，但无法解决我的问题，如果有人能帮助我，我将不胜感激我有三个表term1 ， term2 ， term3 ，它们具有相同的列Adm ， date ， amountneeded ， amountpaid ，日期格式为yyyy-mm-dd我需要从三个表中检索total amountpaid的total amountpaid year group

结果应该是

year    total
2012    323000
2013    423000

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Answer 1

试试这个

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