Correct join syntax within multiple queries and sub queries - mysql

Question

I have two queries that end up having the same format. Each has a Month, a year, and some relevant data per month/year. The schema looks like this:
subs Month Year
8150 1 2015
11060 1 2016
5 2 2014
6962 2 2015
8736 2 2016
Cans months years
2984 1 2015
2724 1 2016
13 2 2014
2563 2 2015
1901 2 2016
The first query syntax looks like this:
SELECT
COUNT(personID) AS subs_per_month,
MONTH(Date_1) AS month_1,
YEAR(Date_1) AS year_1
FROM
(SELECT
personID, MIN(date) AS Date_1
FROM
orders
WHERE
isSubscription = 1
GROUP BY personID
ORDER BY Date_1) AS my_sub_q
GROUP BY month_1 , year_1
The second query:
SELECT
COUNT(ID), MONTH(date) AS months, YEAR(date) AS years
FROM
orders
WHERE
status = 4 AND isSubscription = 1
GROUP BY months , years
ORDER BY months, years
The end goal is to write a simple join so that the final dataset looks like this:
subs cans months years
8150 2984 1 2015
11060 2724 1 2016
5 13 2 2014
6962 2563 2 2015
8736 1901 2 2016
I'm a little overwhelmed with how to do this correctly, and after a lot of trial and all error, I thought I'd ask for help. What's confusing is where the JOIN goes, and how that looks relative to the rest of the syntax.

Answer 1

Without giving consideration to simplifying your queries you can use your two queries as inline views and simply select from both (I aliased Q1 and Q2 for your queries and named fields the same within each for simplicity.
Select Q1.cnt as Subs, Q2.cnt as Cans, Q1.months, Q1.years
from (SELECT
COUNT(personID) AS Cnt,
MONTH(Date_1) as Months,
YEAR(Date_1) AS years
FROM (SELECT personID, MIN(date) AS Date_1
FROM orders
WHERE isSubscription = 1
GROUP BY personID) AS my_sub_q
GROUP BY month_1 , year_1) Q1
INNER JOIN (SELECT COUNT(ID) cnt, MONTH(date) AS months, YEAR(date) AS years
FROM orders
WHERE status = 4
AND isSubscription = 1
GROUP BY months, years) Q2
ON Q1.Months = Q2.Months
and Q1.Years = Q2.years
Order by Q1.years, Q2.months

Answer 2

Temporary table approach:
create temporary table first_query
<<your first query here>>;
create temporary table second_query
<<your second query here>>;
select fq.subs, sq.cans, fq.months, fq.years
from first_query fq
join second_query sq using (months, years)
Your table preview and query columns do not match for first query, so I assumed both tables have columns - months and years.
One messy query approach:
SELECT fq.subs_per_month subs, sq.cans, sq.months, sq.years
FROM
(SELECT
COUNT(personID) AS subs_per_month,
MONTH(Date_1) AS month_1,
YEAR(Date_1) AS year_1
FROM
(SELECT
personID, MIN(date) AS Date_1
FROM
orders
WHERE
isSubscription = 1
GROUP BY personID
ORDER BY Date_1) AS my_sub_q
GROUP BY month_1 , year_1) fq
JOIN
(SELECT
COUNT(ID) cans, MONTH(date) AS months, YEAR(date) AS years -- I added 'cans'
FROM
orders
WHERE
status = 4 AND isSubscription = 1
GROUP BY months , years
ORDER BY months, years) sq
ON fq.month_1 = sq.months AND fq.year_1 = sq.years

Answer 3

Please use following query
select t1.subs as subs,t2.Cans as cans,t1.months,t1.year as years from table1 t1 inner join
table2 t2 on t1.month=t2.months and t1.year=t2.years