How to join two queries in SQL - sql

Question

I have two SQL queries that I want to join.
First query:
SELECT
rp_date, key_code,
sum(case when rp_id=15102 then rp_value else null end) as users_completed,
sum(case when rp_id=15108 then rp_value else null end) as users_inProgress
FROM
te_rp_pc_rate
WHERE
abc_code = 'A204'
AND organisation_id = '444-4'
AND key_ code = '#KL0560'
GROUP BY
rp_date, key_code
ORDER BY
rp_date DESC, key_code
LIMIT 100;
Second query:
SELECT
cr_date
sum(case when rp_id=23101 then rp_value else null end) AS prim_kfc
FROM
te_emk_rate
WHERE
abc_code = 'A204'
AND organisation_id = '444-4'
AND ref_value = 0
GROUP BY
cr_date
ORDER BY
cr_date DESC
LIMIT 100;
The dates (cr_date, rp_date) should be used for joining. For the first query's rp_date for the second cr_date.
The goal is to get the columns in a row for the same date. I've tried, but the results are too high.

Answer 1

You can put your queries into subqueries and join them. Something like this:
SELECT *
FROM (
SELECT rp_date, key_code,
sum(case when rp_id=15102 then rp_value else null end) as users_completed,
sum(case when rp_id=15108 then rp_value else null end) as users_inProgress
from te_rp_pc_rate
WHERE abc_code = 'A204'
AND organisation_id = '444-4'
AND key_ code = '#KL0560'
group by rp_date, key_code
Order By rp_date DESC, key_code
LIMIT 100;
) as q1
LEFT JOIN (
SELECT cr_date, key_code
sum(case when rp_id=23101 then rp_value else null end) as prim_kfc
from te_emk_rate
WHERE abc_code = 'A204'
AND organisation_id = '444-4'
AND ref_value = 0
group by cr_date, key_code
Order By cr_date DESC, key_code
LIMIT 100;
) as q2
on q1.rp_date = q2.cr_date