two sql query mix for one - sql

Question

I want to combine two pieces of code into one, but I'm getting an error:
Part 1
SELECT idstd,namestd, idmajor,
c1, c2, c3, c4, c5, c6,
c7, c8, c9, c10,c11,c12,
c13,c14,c15
FROM
(SELECT status, idstd,namestd, idmajor,
'C' + cast(row_number()
OVER (partition BY idstd, idmajor
ORDER BY (SELECT 1)) AS varchar(10)) col
FROM tbcheked) src
PIVOT (MAX(status) FOR col IN (C1, C2, C3, C4, C5,
C6, C7, C8, C9, C10,
c11,c12,c13,c14,c15)) piv
This code is for checking if the column status has values of present, absent or leave.
Example:
id | c1 | c2 | c3 | c4 | c5 |
1 present absent present leave present
I have the second piece of code for status count:
SELECT idstd,
namemajor,
SUM(CASE WHEN status = 'present'
THEN 1
ELSE 0
END) AS present,
SUM(CASE WHEN status = 'absent'
THEN 1
ELSE 0
END) AS absent,
SUM(CASE WHEN status = 'leave'
THEN 1
ELSE 0
END) AS leave,
FROM tbcheked GROUP BY idstd, namemajor
ORDER BY idstd
Output:
id | present | absent | leave |
1 3 1 1
Now, I want to join both queries:
id | c1 | c2 | c3 | c4 | c5 | present | absent | leave |
1 present absent present leave present 3 1 1

Answer 1

Use join for conbining the output of both the queries.
select a.*, b.*
from (query 1)a join (query 2)b on a.id=b.id;

Answer 2

Treat each part as a sub-query and join them:
select
<whatever>
from
(
SELECT idstd,namestd, idmajor,
c1, c2, c3, c4, c5, c6,
c7, c8, c9, c10,c11,c12,
c13,c14,c15
FROM
(SELECT status, idstd,namestd, idmajor,
'C' + cast(row_number()
OVER (partition BY idstd, idmajor
ORDER BY (SELECT 1)) AS varchar(10)) col
FROM tbcheked) src
PIVOT (MAX(status) FOR col IN (C1, C2, C3, C4, C5,
C6, C7, C8, C9, C10,
c11,c12,c13,c14,c15)) piv
) as PivotedBit
INNER JOIN -- or OUTER, depending on your requirement
(
SELECT idstd,
namemajor,
SUM(CASE WHEN status = 'present'
THEN 1
ELSE 0
END) AS present,
SUM(CASE WHEN status = 'absent'
THEN 1
ELSE 0
END) AS absent,
SUM(CASE WHEN status = 'leave'
THEN 1
ELSE 0
END) AS leave,
FROM tbcheked GROUP BY idstd, namemajor
--ORDER BY idstd -- cannot have this in a sub-query
) as SummingBit
on SummingBit.idstd = PivotedBit.idstd
-- and any other common keys
ORDER BY idstd
It'll do two complete scans of tbcheked, so it won't be fast.
I have a hunch that adding dummy columns to the inner select of the PIVOT query using the CASE statements from the summing query, then adding SUM() to the PIVOT clause would be better. I haven't thought this through fully, however.