Converting Subquery into Single Query - sql

Question

I've a query that has multiple subqueries with parameters as follows:
SELECT
V.EMPNO,
V.FIRST_NAME || ' ' || V.MIDDLE_NAME
|| ' '
|| V.LAST_NAME FULLNAME,
M.APP_NO,
K.TOTAL_AMT,
K.TOTAL_AMT - (SELECT
SUM(Q.RECAMOUNT)
FROM
LOAN_ADJ_DETAILS_NEW q
WHERE
Q.APP_NO = M.APP_NO
AND Q.RECDATE <= '01-AUG-2022') REMAINING,
(SELECT
SUM(P.RECAMOUNT)
FROM
LOAN_ADJ_DETAILS_NEW p
WHERE
P.APP_NO = M.APP_NO
AND P.RECDATE <= '01-AUG-2022') TOTALADJ,
(SELECT
COUNT(*)
FROM
LOAN_ADJ_DETAILS_NEW p
WHERE
P.APP_NO = M.APP_NO
AND P.RECDATE IS NOT NULL
AND P.RECDATE <= '01-AUG-2022') INSTALLMENT,
(SELECT
MAX(Q.RECAMOUNT)
FROM
LOAN_ADJ_DETAILS_NEW q
WHERE
Q.APP_NO = M.APP_NO
AND Q.RECDATE = '01-AUG-2022') LASTINSTALL,
(SELECT
MAX(S.RECDATE)
FROM
LOAN_ADJ_DETAILS_NEW s
WHERE
S.APP_NO = M.APP_NO
AND S.RECDATE <= '01-AUG-2022') LASTDATE,
(SELECT
SUM(P.RECAMOUNT)
FROM
LOAN_ADJ_DETAILS_NEW p
WHERE
P.APP_NO = M.APP_NO
AND P.RECDATE <= '01-AUG-2022') PAID
FROM
LOAN_ADJ_DETAILS_NEW m,
TBL_LOAN_MASTER k,
EMP_PERSONAL v
WHERE
V.EMPNO = M.EMPNO
AND K.LOAN_ID = M.APP_NO
AND M.RECAMOUNT > 0
AND M.RECDATE IS NOT NULL
AND M.RECDATE = '01-AUG-2022'
AND M.RECDATE >= '01-AUG-2022';
The query is simple, just to get user wise loan information. Now the thing is, I require to make it into one query something as follows:
SELECT * FROM TABLE WHERE COLUMN <= PARAMTER;
The above query will be used as a dynamic query from database to front-end. I was hoping if this could be converted to a single query or view anyway.

Answer 1

You can use analytic functions and combine the sub-queries into a single one in the FROM clause:
SELECT V.EMPNO,
V.FIRST_NAME || ' ' || V.MIDDLE_NAME || ' ' || V.LAST_NAME
AS FULLNAME,
M.APP_NO,
K.TOTAL_AMT,
K.TOTAL_AMT - m.paid AS REMAINING,
m.totaladj,
m.paid,
m.installment,
m.lastinstall,
m.lastdate
FROM ( SELECT app_no,
empno,
recamount,
recdate,
SUM(RECAMOUNT) OVER (PARTITION BY app_no) AS totaladj,
SUM(RECAMOUNT) OVER (PARTITION BY app_no) AS paid,
COUNT(*) OVER (PARTITION BY app_no) AS installment,
MAX(RECAMOUNT) OVER (PARTITION BY app_no) AS lastinstall,
MAX(RECDATE) OVER (PARTITION BY app_no) AS lastdate
FROM LOAN_ADJ_DETAILS_NEW
WHERE RECDATE <= DATE '2022-08-01'
) m
INNER JOIN TBL_LOAN_MASTER k
ON (K.LOAN_ID = M.APP_NO)
INNER JOIN EMP_PERSONAL v
ON (V.EMPNO = M.EMPNO)
WHERE M.RECAMOUNT > 0
AND M.RECDATE = DATE '2022-08-01';