Question

在DB2中，我有2个正在使用WITH进行子选择的工作查询。

它们各自独立工作，但我似乎找不到找到正确组合或结合它们的最佳方法。

第一个查询：

  with c as(
select
  employee,
  sum(salesPrice) as priorSpecifics
from schema1.orders g
    inner join dateSchema.dates d
    on g.dateField = d.dateField
where  d.newDate between '2018-01-01' and '2018-01-31'
and g.details = 'CategoryOne'
group by employee
), d as(
select
  employee,
  sum(salesPrice) as priorTotals
from schema1.orders g
    inner join dateSchema.dates d
    on g.dateField = d.dateField
where  d.newDate between '2018-01-01' and '2018-01-31'
group by employee
)
Select  ifnull(c.employee,d.employee) as employee
      ,c.priorSpecifics
      ,d.priorTotals
      ,cast(Round((DEC(c.priorSpecifics,12,2)/DEC(d.priorTotals,12,2)) * 100,2) as decimal(12,2)) as priorPercent
  from c full join d ON (c.employee = d.employee);

返回4列

和第二个查询

with c as(
select
  employee,
  sum(salesPrice) as currentSpecifics
from schema1.orders g
    inner join dateSchema.dates d
    on g.dateField = d.dateField
where  d.newDate between '2019-01-01' and '2019-01-31'
and g.details = 'CategoryOne'
group by employee
), d as(
select
  employee,
  sum(salesPrice) as currentTotals
from schema1.orders g
    inner join dateSchema.dates d
    on g.dateField = d.dateField
where  d.newDate between '2019-01-01' and '2019-01-31'
group by employee
)
Select  ifnull(c.employee,d.employee) as employee
      ,c.currentSpecifics
      ,d.currentTotals
      ,cast(Round((DEC(c.currentSpecifics,12,2)/DEC(d.currentTotals,12,2)) * 100,2) as decimal(12,2)) as currentPercent
  from c full join d ON (c.employee = d.employee);

也返回4。 employee字段是所有人之间唯一共享的东西。

如何将其组合到一个查询中以获取一个雇员列，然后跟随我的所有总和/百分比列？

Answer 1

我认为您可以通过条件聚合来完成您想做的所有事情：

select employee,
       sum(case when d.newDate between '2018-01-01' and '2018-01-31' and g.details = 'CategoryOne' then salesPrice end) as priorSpecifics,
       sum(case when d.newDate between '2019-01-01' and '2019-01-31' and g.details = 'CategoryOne' then salesPrice end) as currentSpecifics,
       sum(case when d.newDate between '2018-01-01' and '2018-01-31' then salesPrice end) as priorTotals,
       sum(case when d.newDate between '2019-01-01' and '2019-01-31' then salesPrice end) as currentTotals
from schema1.orders g inner join
     dateSchema.dates d
     on g.dateField = d.dateField
group by employee;

我将让您填写其他计算结果。

Answer 2

如果以上所有查询均有效，则您已经拥有所需的一切。
您必须从第一个组，前两个组中合并才能进行prior查询，然后
来自第二组以进行cur查询
最后将prior查询加入到cur查询中：

with 
c as(
select
  employee,
  sum(salesPrice) as priorSpecifics
from schema1.orders g
    inner join dateSchema.dates d
    on g.dateField = d.dateField
where  d.newDate between '2018-01-01' and '2018-01-31'
and g.details = 'CategoryOne'
group by employee
),

d as(
select
  employee,
  sum(salesPrice) as priorTotals
from schema1.orders g
    inner join dateSchema.dates d
    on g.dateField = d.dateField
where  d.newDate between '2018-01-01' and '2018-01-31'
group by employee
),

prior as (
Select  ifnull(c.employee,d.employee) as employee
      ,c.priorSpecifics
      ,d.priorTotals
      ,cast(Round((DEC(c.priorSpecifics,12,2)/DEC(d.priorTotals,12,2)) * 100,2) as decimal(12,2)) as priorPercent
  from c full join d ON (c.employee = d.employee)
),

e as(
select
  employee,
  sum(salesPrice) as currentSpecifics
from schema1.orders g
    inner join dateSchema.dates d
    on g.dateField = d.dateField
where  d.newDate between '2019-01-01' and '2019-01-31'
and g.details = 'CategoryOne'
group by employee
),

f as(
select
  employee,
  sum(salesPrice) as currentTotals
from schema1.orders g
    inner join dateSchema.dates d
    on g.dateField = d.dateField
where  d.newDate between '2019-01-01' and '2019-01-31'
group by employee
),

cur as (
Select  ifnull(e.employee,f.employee) as employee
      ,e.currentSpecifics
      ,f.currentTotals
      ,cast(Round((DEC(e.currentSpecifics,12,2)/DEC(f.currentTotals,12,2)) * 100,2) as decimal(12,2)) as currentPercent
  from e full join f ON (e.employee = f.employee)
)

Select  ifnull(p.employee, c.employee) as employee
      ,p.priorSpecifics
      ,p.priorTotals
      ,p.priorPercent
      ,c.currentSpecifics
      ,c.currentTotals
      ,c.currentPercent
from prior p full join cur c ON (c.employee = c.employee);

UNION对2个联合查询

2 个答案: