Question

我试图在SQL Server中创建一个脚本，该脚本将对列下的值进行计数，但是我希望它仍报告未计数的缺失值。

目前，我的分组设置为以下设置，但将结果减半：

select count(ID) as Count, Building, ID
from table
group by Building, ID

我希望我的输出显示每个ID的计数，如果每个ID都没有计数，则显示空值。

Building  ID
1234      1
1234      2
4567      3
4567      4
8910      5
0         6

Want the Output To Be:
Building  ID Count
1234       1   2
1234       2   2
4567       3   2
4567       4   2
8910       5   1
0          6   0

总人口200,000。我想查看200,000条记录，其中包含每个名称的总计数或空值。运行上述脚本时，每条记录获得1。

示例：如果ID 1的计数为2，而ID 2的计数为2，我希望两个ID都显示为每个ID单独的计数。

Answer 1

您需要从子查询中获取计数，然后加入该子查询

SELECT 
   CASE WHEN t1.building is null THEN 0
   ELSE t1.building END AS Building,
   t1.id, 
   CASE WHEN t1.building is null THEN 0
   ELSE t2.count END AS Count
FROM table t1
JOIN (SELECT building, COUNT(*) as count 
      FROM table 
      GROUP BY building) AS t2 ON t2.building = t1.building OR (t2.building is null AND t1.building is null)

Answer 2

尝试

select count(name) as Count, ID, Building
from table
group by ID, Building

计算列中的值

2 个答案: