Database 连接条件显示不适当的结果

我最近写了这个查询，在上面的查询中没有满足条件b.status='yes'，status在其中显示NULL值。我想根据此条件优化我的记录。状态为“是”。

请尝试以下操作：

    SELECT   a.name,
             nvl(c.bill_amount,0),
             b.status
        FROM  table_1 a left outer join table_2 b
        ON  a.name = b.name and
           b.status = 'YES'
        left outer join table_3 c on B.phone_number = C.phone_number
             AND B.email = C.email
             where 
             a.VALID = 'Y';

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@请看我的最新答案。这个很好用

   SELECT  a.name, nvl(c.bill_amount,0), b.status
   FROM  table_1 a left outer join table_2 b
   ON  a.name = b.name
   left outer join table_3 c on b.phone_number = c.phone_number
   where 
   a.VALID = 'Y' and
   b.status = 'YES' and
   b.email = c.email