Group by + Select Case - sql

Question

I try to query this code but i got the error massage.
"ORA-00979: not a GROUP BY expression"
Can we use case SUM and Max in group by function.
SELECT PLAN.MFGNO "MFGNO",
PROCESSMASTER.PART_NO "PART_NO",
PROCESS.MED_PROC_CD "M_PROCESS",
MAX(PLAN.PLAN_START) "PLAN_START_DATE",
MAX(PLAN.PLAN_END) "PLAN_END_DATE",
MAX(PLAN.ACT_START) "ACT_START_DATE",
MAX(PLAN.ACT_END) "ACT_END_DATE",
(CASE WHEN PROCESSMASTER.COMP_FLG =1 AND PROCESS.MED_PROC_CD='OUT-P' THEN SUM(SUB_PRO.HACYUKIN)
ELSE MAX(SUB_PRO.HACYUKIN)
END) "SUB_TOTAL_PRICE",
--SUM(SUB_PRO.HACYUKIN) "SUB_TOTAL_PRICE",
MAX(SUB_PRO.SICD) "SUB_CODE",
MAX(PROCESSMASTER.PROC_REM) "DE_PROCESS"
FROM T_PLANDATA PLAN
INNER JOIN T_PROCESSNO PROCESSMASTER
ON PLAN.BARCODE = PROCESSMASTER.BARCODE
INNER JOIN T_PLANNED_PROCESS PROCESS
ON PROCESSMASTER.PROCESS_CD = PROCESS.PLAN_PROC_CD
INNER JOIN KEIKAKUMST SUB_PRO
ON PROCESSMASTER.BARCODE = SUB_PRO.KMSEQNO
WHERE PLAN.MFGNO ='T21-F2D1-10034'
GROUP BY PLAN.MFGNO,
PROCESSMASTER.PART_NO,
PROCESS.MED_PROC_CD;

Answer 1

Can we use case SUM and Max in group by function.
Yes
However, your problem is that you use PROCESSMASTER.COMP_FLG =1 AND PROCESS.MED_PROC_CD = 'OUT-P' inside the CASE expression and neither PROCESSMASTER.COMP_FLG nor PROCESS.MED_PROC_CD are in the GROUP BY clause or inside of an aggregation function.
You either want:
SELECT PLAN.MFGNO "MFGNO",
PROCESSMASTER.PART_NO "PART_NO",
PROCESS.MED_PROC_CD "M_PROCESS",
MAX(PLAN.PLAN_START) "PLAN_START_DATE",
MAX(PLAN.PLAN_END) "PLAN_END_DATE",
MAX(PLAN.ACT_START) "ACT_START_DATE",
MAX(PLAN.ACT_END) "ACT_END_DATE",
(CASE WHEN PROCESSMASTER.COMP_FLG =1 AND PROCESS.MED_PROC_CD='OUT-P' THEN SUM(SUB_PRO.HACYUKIN)
ELSE MAX(SUB_PRO.HACYUKIN)
END) "SUB_TOTAL_PRICE",
--SUM(SUB_PRO.HACYUKIN) "SUB_TOTAL_PRICE",
MAX(SUB_PRO.SICD) "SUB_CODE",
MAX(PROCESSMASTER.PROC_REM) "DE_PROCESS"
FROM T_PLANDATA PLAN
INNER JOIN T_PROCESSNO PROCESSMASTER
ON PLAN.BARCODE = PROCESSMASTER.BARCODE
INNER JOIN T_PLANNED_PROCESS PROCESS
ON PROCESSMASTER.PROCESS_CD = PROCESS.PLAN_PROC_CD
INNER JOIN KEIKAKUMST SUB_PRO
ON PROCESSMASTER.BARCODE = SUB_PRO.KMSEQNO
WHERE PLAN.MFGNO ='T21-F2D1-10034'
GROUP BY PLAN.MFGNO,
PROCESSMASTER.PART_NO,
PROCESS.MED_PROC_CD,
PROCESSMASTER.COMP_FLG, -- Add to the group by clause
PROCESS.MED_PROC_CD -- Add to the group by clause
;
or something like:
SELECT PLAN.MFGNO "MFGNO",
PROCESSMASTER.PART_NO "PART_NO",
PROCESS.MED_PROC_CD "M_PROCESS",
MAX(PLAN.PLAN_START) "PLAN_START_DATE",
MAX(PLAN.PLAN_END) "PLAN_END_DATE",
MAX(PLAN.ACT_START) "ACT_START_DATE",
MAX(PLAN.ACT_END) "ACT_END_DATE",
CASE
WHEN MAX(PROCESSMASTER.COMP_FLG) = 1
AND COUNT(CASE WHEN PROCESS.MED_PROC_CD = 'OUT-P' THEN 1 END) > 0
THEN SUM(SUB_PRO.HACYUKIN)
ELSE MAX(SUB_PRO.HACYUKIN)
END "SUB_TOTAL_PRICE",
--SUM(SUB_PRO.HACYUKIN) "SUB_TOTAL_PRICE",
MAX(SUB_PRO.SICD) "SUB_CODE",
MAX(PROCESSMASTER.PROC_REM) "DE_PROCESS"
FROM T_PLANDATA PLAN
INNER JOIN T_PROCESSNO PROCESSMASTER
ON PLAN.BARCODE = PROCESSMASTER.BARCODE
INNER JOIN T_PLANNED_PROCESS PROCESS
ON PROCESSMASTER.PROCESS_CD = PROCESS.PLAN_PROC_CD
INNER JOIN KEIKAKUMST SUB_PRO
ON PROCESSMASTER.BARCODE = SUB_PRO.KMSEQNO
WHERE PLAN.MFGNO ='T21-F2D1-10034'
GROUP BY PLAN.MFGNO,
PROCESSMASTER.PART_NO,
PROCESS.MED_PROC_CD;
Note: this is untested as you have not provided a minimal representative example of your tables or data to test against.