在 oracle 中加入三个具有计数和总和的表

Question

I have three tables and trying to join these tables with count(working_days) and sum(Overtime) functions but overtime is not showing correct i am trying the query is.

SELECT E.EMP_CODE,E.EMP_NAME,
COALESCE(SUM(O.OVERTIME),0) AS OVERTIME,COALESCE(COUNT(C.EMP_ATT),0) WORKED_DAYS
FROM EMP E
LEFT JOIN OVERTIME   O
ON E.EMP_CODE = O.EMP_CODE
LEFT JOIN ATT_REG C
ON E.EMP_CODE=C.EMP_CODE
GROUP BY E.EMP_CODE,E.EMP_NAME 
ORDER BY EMP_CODE

Answer 1

Yes, You will get multiple records of the overtime for employees as shift date (or similar in your table) is missing in the join.

SELECT E.EMP_CODE,E.EMP_NAME,
COALESCE(SUM(O.OVERTIME),0) AS OVERTIME,
COALESCE(COUNT(C.EMP_ATT),0) WORKED_DAYS
FROM EMP E
LEFT JOIN ATT_REG C
ON E.EMP_CODE=C.EMP_CODE
LEFT JOIN OVERTIME   O
ON E.EMP_CODE = O.EMP_CODE 
AND C.SHIFTDATE = O.SHIFDATE -- YOU NEED SOMETHING LIKE THIS
GROUP BY E.EMP_CODE,E.EMP_NAME 
ORDER BY EMP_CODE