Joining multiple CTEs - sql

Question

I am working on a database of a large retail store.
I have to query data from multiple tables to get numbers such as revenue, raw proceeds and compare different time periods.
Most of it is quite easy but I was struggling to work out a way of joining multiple CTEs.
I made a fiddle so you know what I am talking about.
I simplified the structure a lot and left out quite a few columns in the subqueries because they do not matter in this case.
As you can see every row in every table has country and brand in it.
The final query has to be grouped by those.
What I first tried was to FULL JOIN all the tables, but that didn't work in some cases as you can see here: SQLfiddle #1. Note the two last rows which did not group correctly.
Select Coalesce(incoming.country, revenue.country, revcompare.country,
openord.country) As country,
Coalesce(incoming.brand, revenue.brand, revcompare.brand,
openord.brand) As brand,
incoming.OrdersNet,
openord.OpenOrdersNet,
revenue.Revenue,
revenue.RawProceeds,
revcompare.RevenueCompare,
revcompare.RawProceedsCompare
From incoming
Full Join openord On openord.country = incoming.country And
openord.brand = incoming.brand
Full Join revenue On revenue.country = incoming.country And
revenue.brand = incoming.brand
Full Join revcompare On revcompare.country = incoming.country And
revcompare.brand = incoming.brand
Group By incoming.OrdersNet,
openord.OpenOrdersNet,
revenue.Revenue,
revenue.RawProceeds,
revcompare.RevenueCompare,
revcompare.RawProceedsCompare,
incoming.country,
revenue.country,
openord.country,
revcompare.country,
incoming.brand,
revenue.brand,
revcompare.brand,
openord.brand
Order By country,
brand
I then rewrote the query keeping all the CTEs. I added another CTE (basis) which UNIONs all the possible country and brand combinations and left joined on that one.
Now it works fine (check it out here -> SQLfiddle #2) but it just seems so complicated. Isn't there an easier way to achieve this? The only thing I probably won't be able to change are the CTEs as in real life they are way more complex.
WITH basis AS (
SELECT Country, Brand FROM incoming
UNION
SELECT Country, Brand FROM openord
UNION
SELECT Country, Brand FROM revenue
UNION
SELECT Country, Brand FROM revcompare
)
SELECT
basis.Country,
basis.Brand,
incoming.OrdersNet,
openord.OpenOrdersNet,
revenue.Revenue,
revenue.RawProceeds,
revcompare.RevenueCompare,
revcompare.RawProceedsCompare
FROM basis
LEFT JOIN incoming On incoming.Country = basis.Country AND incoming.Brand = basis.Brand
LEFT JOIN openord On openord.Country = basis.Country AND openord.Brand = basis.Brand
LEFT JOIN revenue On revenue.Country = basis.Country AND revenue.Brand = basis.Brand
LEFT JOIN revcompare On revcompare.Country = basis.Country AND revcompare.Brand = basis.Brand
Thank you all for your help!

Answer 1

Since you only work with two tables, orders and rev, consider conditional aggregation by moving WHERE conditions to CASE logic for single aggregate query. Also, consider only one CTE for all possible country/brand pairs for LEFT JOIN on the two tables.
WITH cb AS (
SELECT Country, Brand FROM orders
UNION
SELECT Country, Brand FROM rev
)
SELECT cb.Country
, cb.Brand
, SUM(o.netprice) AS OrdersNet
, SUM(CASE
WHEN o.isopen = 1
THEN o.netprice
END) AS OpenOrdersNet
, SUM(CASE
WHEN r.bdate BETWEEN '2020-12-01' AND '2020-12-31'
THEN r.netprice
END) AS Revenue
, SUM(CASE
WHEN r.bdate BETWEEN '2020-12-01' AND '2020-12-31'
THEN r.rpro
END) AS RawProceeds
, SUM(CASE
WHEN r.bdate BETWEEN '2020-11-01' AND '2020-11-30'
THEN r.netprice
END) AS RevenueCompare
, SUM(CASE
WHEN r.bdate BETWEEN '2020-11-01' AND '2020-11-30'
THEN r.rpro
END) AS RawProceedsCompare
FROM cb
LEFT JOIN orders o
ON cb.Country = o.Country
AND cb.Brand = o.Brand
LEFT JOIN rev r
ON cb.Country = r.Country
AND cb.Brand = r.Brand
GROUP BY cb.Country
, cb.Brand
SQL Fiddle