Sql 关于2个联接查询的并集

我有两个工作查询，它们通过DB2中的

WITH

子选择连接起来

它们各自独立工作，但我似乎找不到最好的方法来正确地组合或结合它们

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

还有第二个问题

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。“员工”字段是所有人共享的唯一内容

---

我如何将其合并到一个查询中，得到一个employee列，然后得到下面所有的总和/百分比列？

我认为通过条件聚合，您可以做任何您想做的事情：

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;

---

我将让您填写额外的计算。

我认为您可以通过条件聚合完成所有您想要的事情：

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;

---

我将让您填写额外的计算。

如果以上所有查询都有效，那么您已经拥有了所需的一切
您必须从第一组（前两组）中组合，以进行

previor

查询，然后进行
从第二组进行

cur

查询
最后将

previor

查询连接到

cur

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
),

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);

---

如果以上所有查询都正常工作，那么您已经拥有了所需的一切
您必须从第一组（前两组）中组合，以进行

previor

查询，然后进行
从第二组进行

cur

查询
最后将

previor

查询连接到

cur

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
),

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);

---

尝试在这里使用别名来表示百分比是行不通的，不过如果我将整个计算都放在除法的每一端，那么就行了。在DB2中，是否没有办法在select列中使用别名作为其他select列的条件？尝试在这里使用别名作为百分比是行不通的，不过如果我将整个计算都放在除法的每一端，那么它就会起作用。DB2中是否没有办法在select中使用别名作为其他select列的条件？