MySQL combining COUNT, MAX and SUM - mysql

Question

In MySQL, I would like to have an extra column showing the sum of values of a particular column. However, the numbers I would like to sum come from a subquery and are not stored in a separate table, something like this:
(SELECT a.ID, MAX(a.COUNT_ID) AS MAX_COUNT FROM
(SELECT ID, COUNT(*) AS COUNT_ID
FROM my_table
GROUP BY COL1, COL2) a
GROUP BY COL1, COL2) b
And this would output something like:
ID MAX_COUNT
ABC 1
DEF 2
GHI 3
And now, I want an extra column showing the sum of MAX_COUNT, like this (repeated over all rows):
ID MAX_COUNT SUM_MAX_COUNT
ABC 1 6
DEF 2 6
GHI 3 6
The actual goal is actually to show the percentage MAX_COUNT of the total MAX_COUNT, so 1/6, 2/6 and 3/6.
How do I do this? I already tried doing a CROSS JOIN but it doesn't work:
SELECT * FROM
((SELECT a.ID, MAX(a.COUNT_ID) AS MAX_COUNT FROM
(SELECT ID, COUNT(*) AS COUNT_ID
FROM my_table
GROUP BY COL1, COL2) a
GROUP BY COL1, COL2) b
CROSS JOIN (SELECT SUM(b.MAX_COUNT)) AS c
Error: Unknown table 'b'
EXAMPLE
Example table:
CREATE TABLE TABLE1 (
COL1 varchar(255),
COL2 varchar(255),
DAY int,
HOUR int);
INSERT INTO TABLE1 VALUES
('X','Y',1,12),
('X','Y',1,13),
('X','Y',1,13),
('A','B',2,19),
('X','B',3,13),
('X','B',3,13);
Now I want to have, for each combination of COL1 and COL2, the number of lines in this table for each hour:
SELECT COL1, COL2, HOUR, COUNT(*) AS COUNT_LINES
FROM TABLE1
GROUP BY DAY, HOUR, COL1, COL2;
Which outputs this:
COL1 COL2 HOUR COUNT_LINES
X Y 12 1
X Y 13 2
A B 19 1
X B 13 2
Now I want, for each combination of COL1 and COL2, the maximum of COUNT_LINES, so I use the query above in a subquery:
SELECT a.COL1, a.COL2, MAX(a.COUNT_LINES)
FROM
(SELECT COL1, COL2, HOUR, COUNT(*) AS COUNT_LINES
FROM TABLE1
GROUP BY DAY, HOUR, COL1, COL2) a
GROUP BY COL1, COL2;
Which outputs this:
COL1 COL2 MAX(COUNT_LINES)
A B 1
X B 2
X Y 2
Now in the last step, I want the SUM of MAX(COUNT_LINES) column in a separate column, like this:
COL1 COL2 MAX(COUNT_LINES) SUM(MAX(COUNT_LINES))
A B 1 5
X B 2 5
X Y 2 5
But that is the part I don't know how to do.

Answer 1

Try this:
SELECT COL1,Max(COUNT_ID),Sum(SUM_MAX_COUNT) FROM(
SELECT COL1,
Count(*) AS COUNT_ID,
(SELECT Sum(Count(*))
FROM TABLE_NAME
GROUP BY COL1) AS SUM_MAX_COUNT
FROM TABLE_NAME
GROUP BY COL1)
GROUP BY COL1;

Answer 2

Use CTE for this
with q as
(
SELECT a.COL1, a.COL2, MAX(a.COUNT_LINES) cmax
FROM
(SELECT COL1, COL2, HOUR, COUNT(*) AS COUNT_LINES
FROM TABLE1
GROUP BY DAY, HOUR, COL1, COL2) a
GROUP BY COL1, COL2
)
SELECT q.*, (SELECT SUM(q.cmax) from q)
FROM q
dbfiddle demo
which can be rewritten (for older MySQL) as
SELECT q.*,
(
SELECT SUM(cmax) from
(
SELECT a.COL1, a.COL2, MAX(a.COUNT_LINES) cmax
FROM
(SELECT COL1, COL2, HOUR, COUNT(*) AS COUNT_LINES
FROM TABLE1
GROUP BY DAY, HOUR, COL1, COL2) a
GROUP BY COL1, COL2
) q
) as max_sum
FROM
(
SELECT a.COL1, a.COL2, MAX(a.COUNT_LINES) cmax
FROM
(SELECT COL1, COL2, HOUR, COUNT(*) AS COUNT_LINES
FROM TABLE1
GROUP BY DAY, HOUR, COL1, COL2) a
GROUP BY COL1, COL2
) q
dbfiddle demo

Answer 3

This seems to give the right answer:
mysql-sql> select
... x.col1,
... x.col2,
... x.max_count_lines,
... y.sum_max_count_lines
... from
... (
... select
... a.col1,
... a.col2,
... max(a.count_lines) as max_count_lines
... from
... (
... select
... col1,
... col2,
... hour,
... count(*) as count_lines
... from
... table1
... group by
... day,
... hour,
... col1,
... col2
... ) a
... group by
... col1,
... col2
... ) x,
... (
... select
... sum(max_count_lines) as sum_max_count_lines
... from
... (
... select
... b.col1,
... b.col2,
... max(b.count_lines) as max_count_lines
... from
... (
... select
... col1,
... col2,
... hour,
... count(*) as count_lines
... from
... table1
... group by
... day,
... hour,
... col1,
... col2
... ) b
... group by
... col1,
... col2
... ) c
... ) y;
+------+------+-----------------+---------------------+
| col1 | col2 | max_count_lines | sum_max_count_lines |
+------+------+-----------------+---------------------+
| A | B | 1 | 5 |
| X | B | 2 | 5 |
| X | Y | 2 | 5 |
+------+------+-----------------+---------------------+
3 rows in set (0.00 sec)