Dividing two COUNTS from mysql - mysql

Question

Friends, I am trying to divide two COUNT(*) from MySQL:
I have this query:
SELECT 'Total ', COUNT(*)
FROM root4
WHERE str_to_date(DATE, '%d.%m.%Y') = CURDATE()
UNION
SELECT 'Good', COUNT(*)
FROM root4
WHERE str_to_date(DATE, '%d.%m.%Y') = CURDATE()
AND testresult ='OK'
The output of this query is looking like this:
________________________
|Total | COUNT(*) |
________________________
|Total| 42 |
|Good | 34 |
_______________________
What I want to achieve is to make another row under "Good" called "FPY" but the value to the dividing of "Good" to "Total" in percentage.
Something like this:
________________________
|Total | COUNT(*) |
________________________
|Total| 42 |
|Good | 34 |
|FPY | 80.95 |
_______________________
I tried to divide them like noob:
SELECT 'Total ', COUNT(*)
FROM root4
WHERE str_to_date(DATE, '%d.%m.%Y') = CURDATE()
UNION
SELECT 'Good', COUNT(*)
FROM root4 WHERE str_to_date(DATE, '%d.%m.%Y') = CURDATE()
AND testresult ='OK'
UNION
SELECT 'FPY', (COUNT(*)
FROM root4
WHERE str_to_date(DATE, '%d.%m.%Y') = CURDATE() /
UNION
SELECT 'Good', COUNT(*)
FROM root4
WHERE str_to_date(DATE, '%d.%m.%Y') = CURDATE()
AND testresult ='OK')
Of course, this is not working...
Note: Colum DATE is varchar that`s why I am using str_to_date.

Answer 1

Look for this:
SELECT COUNT(*) AS Total,
SUM(testresult ='OK') AS Good,
100 * COUNT(*) / SUM(testresult ='OK') AS FPY
FROM root4
WHERE `date` = DATE_FORMAT(CURRENT_DATE, '%d.%m.%Y')
is there any way to print it in two columns as I post in the question? – Azim Feta
WITH cte AS (
SELECT COUNT(*) AS Total,
SUM(testresult ='OK') AS Good
FROM root4
WHERE `date` = DATE_FORMAT(CURRENT_DATE, '%d.%m.%Y')
)
SELECT 'Total' AS indicator, Total AS value FROM cte
UNION ALL
SELECT 'Good', Good FROM cte
UNION ALL
SELECT 'FPY', 100 * Good / Total FROM cte

Answer 2

I think you could be needing a "SubQuery" here.
Something like this:
SELECT
Count(root4.*) AS Total,
root4_1.Good AS Good,
COUNT(root4.*) / root4_1.Good AS FYP
FROM
root4,
(
SELECT
COUNT(*) AS Good
FROM
root4
WHERE
str_to_date(DATE, '%d.%m.%Y') = CURDATE()
AND
testresult ='OK'
)AS root4_1
WHERE
str_to_date(DATE, '%d.%m.%Y') = CURDATE()
Also, see this question, which is similar: How to SELECT based on value of another SELECT