3个表的左外部联接

Question

我正在尝试获取阴影区域中不同人员的数量。

表结构如下：

    customer       key
    A234            1
    A345            4
    A12             5
    A989            6

HIVE查询：

    select count(distinct(a.customer)) 
    from (
        select *
         from cust
         where key in (1,2,3)) c 
    left outer join (
        select *
         from cust
         where key in (4,5)) a on a.customer= c.customer where c.customer is null
         join
            (select *
             from cust
             where key in (6,7,8,9)) d on c.customer = d.customer and d.customer is null;

错误：

在“ null”附近的“ join”处缺少EOF

Answer 1

您有一个语法问题，因为from子句后面跟随where ，而给定的select只有一个where 。

我只会使用group by并且having 。 获得客户：

select c.customer
from cust c
group by c.customer
having sum(case when key in (1, 2, 3) then 1 else 0 end) > 0 and
       sum(case when key in (4, 5, 6, 7, 8, 9) then 1 else 0 end) = 0;

然后可以使用子查询对它们进行计数：

select count(*)
from (select c.customer
      from cust c
      group by c.customer
      having sum(case when key in (1, 2, 3) then 1 else 0 end) > 0 and
             sum(case when key in (4, 5, 6, 7, 8, 9) then 1 else 0 end) = 0
    ) c