[英]How to user PARTITION BY without GROUP BY clause
I have a simple query where I need to sum up all Premium per policy Number.我有一个简单的查询,我需要总结每个保单编号的所有保费。 It gives me an error because I need to group it by
Premium
.它给了我一个错误,因为我需要按
Premium
对其进行分组。 Is any way to achieve this without grouping by "Premium"?有什么方法可以在不按“高级”分组的情况下实现这一目标?
Sample query:示例查询:
declare @Test table (PolicyNumber varchar(50), Coverage varchar(50), Premium money)
insert into @Test
select 'Pol1' as PolicyNumber, 'Coverage1' as Coverage, 100 as Premium
UNION ALL select 'Pol1', 'Coverage2', 200
UNION ALL select 'Pol1', 'Coverage2', 25
UNION ALL select 'Pol1', 'Coverage3', 500
UNION ALL select 'Pol1', 'Coverage4', 300
UNION ALL select 'Pol1', 'Coverage4', 25
UNION ALL select 'Pol1', 'Coverage5', 150
select
PolicyNumber,
Coverage,
SUM(Premium) as Premium,
-- this gives an error
PremiumPerPolicy = SUM(Premium) OVER (Partition by PolicyNumber)
from @Test
group by PolicyNumber, Coverage
The result should look like this结果应该是这样的
PolicyNumber Coverage Premium PremiumPerPolicy
Pol1 Coverage1 100 1300
Pol1 Coverage2 225 1300
Pol1 Coverage3 500 1300
Pol1 Coverage4 325 1300
Pol1 Coverage5 150 1300
You can aggregate your value normally and then aggerate again using a window function.您可以正常聚合您的值,然后使用 window function 再次聚合。
SUM(Premium) OVER (Partition by PolicyNumber)
becomes变成
SUM(SUM(Premium)) OVER (Partition by PolicyNumber)
Just pre-calculate your partition sum first.只需先预先计算您的分区总和。 I have also assumed that its possible to have multiple policy numbers (again not shown in your sample data).
我还假设它可能有多个保单编号(同样未在您的示例数据中显示)。
with cte as (
select
PolicyNumber
, Coverage
, Premium
, sum(Premium) over (partition by PolicyNumber) PremiumSum
from @Test
)
select PolicyNumber, Coverage, sum(premium), PremiumSum
from cte
group by PolicyNumber, Coverage, PremiumSum;
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