SQL：子查询问题

Question

Table A
----------------
Date  index
------------------
2016-10-20   2.3
2016-10-21   2.8
-------      ---
-------      ---


Table B:
--------
Code Life_completed
A      5
b      6

实际查询：

select *,(select sum(index) 
          from table1 
          where date between current_date +3 AND current_date
          ) as Index 
from table b

预期查询： 我们可以用current_date +Life_completed

替换current_date +3

我们正在使用vertica数据库..

请在这里帮忙..

Answer 1

此相关子查询与左连接加上总和相同：

select b.Code, b.Life_completed,
   sum(a.index) as Index 
from tableB b 
left join tableA as a 
  on a.date between current_date AND current_date + B.life_completed