Question

我有如下查询，可以正常使用：

select id_matched
     , count(*) s_count
  into STEVEN_1c 
  from batch 
 where match = 200 
 group by 
       id_matched

现在我想在此查询中添加第二个计数列，这是一个稍微更具体的查询，它还会检查另一列，即添加名为“count_unique”的列，其中“unique”列为“1”。

类似

select id_matched
     , count(*) s_count
     , count(* + and unique=1) count_unique
  into STEVEN_1c 
  from batch 
 where match = 200 
 group by 
       id_matched

只是不确定添加第二个比第一个更具体的计数列的语法是什么？

Answer 1

试试这个：

select id_matched
     , count(*) s_count
     , sum(case when unique = 1 then 1 else 0 end) count_unique
  into STEVEN_1c 
  from batch 
 where match = 200 
 group by 
       id_matched

Answer 2

您可以在计数函数中编写一个案例条件，如下所示：

select id_matched
, count(*) s_count
, count(case [unique] when 1 then 1 else null end) as count_unique
into STEVEN_1c 
from batch 
where match = 200 
group by 
id_matched

选择进入查询，添加带有不同子句的第二个计数列

2 个答案: