How to consolidate 3 SQL-queries in one - mysql

Question

I have three separate queries and need to combine it in one to prepare data for a chart. So the common parameter for all 3 datasets is the date.
Please help me to do it.
1)
SELECT COUNT(id) Registrations, regdate
FROM wpu_users
WHERE regdate >= '2020-01-09'
GROUP BY regdate;
2)
SELECT ROUND(SUM(total)) as amount, DATE(datetime) as date
FROM wp_payments
WHERE site_id=4 AND status=1
GROUP BY date
ORDER BY date DESC
3)
SELECT ROUND(SUM(cnt)) as Matrix, DATE(datetime) as date
FROM wp_payments
WHERE site_id=4
AND status=1
AND currency='USD'
AND description LIKE '% + %'
AND datetime IS NOT NULL
GROUP BY date
The result should be a table with columns:
Registrations
amount
Matrix
date

Answer 1

Based on your requirement. try this
SELECT
tab1.Registrations as "Registrations",
tab2.amount as "Amount",
tab3.Matrix as "Matrix",
tab1.regdate as "Date"
FROM
( SELECT COUNT( id ) Registrations, regdate FROM wpu_users where regdate >= '2020-01-09' GROUP BY regdate ) tab1
INNER JOIN (
SELECT
ROUND( SUM( total ) ) AS amount,
DATE( datetime ) AS date
FROM
wp_payments
WHERE
site_id = 4
AND STATUS = 1
GROUP BY
date
) tab2 ON tab1.regdate = tab2.date
INNER JOIN (
SELECT
ROUND( SUM( cnt ) ) AS Matrix,
DATE( datetime ) AS date
FROM
wp_payments
WHERE
site_id = 4
AND STATUS = 1
AND currency = 'USD'
AND description LIKE '% + %'
AND datetime IS NOT NULL
GROUP BY
date
) tab3 ON tab1.regdate = tab3.date