Question

我有以下SQL表达式：

SELECT PROFESSOR_NAME, SUBJECT_NAME, NUMBER_OF_CREDITS, PERCENT,
  (SELECT COUNT(STUDENTID)
    FROM SUBJSTUD
    WHERE SUBJSTUD.SUBJECTID = SUBJECT.SUBJECT_ID) AS NUMBER_OF_STUDENTS,
  0.4*NUMBER_OF_CREDITS*PERCENT*(
    SELECT COUNT(STUDENTID)
    FROM SUBJSTUD
    WHERE SUBJSTUD.SUBJECTID = SUBJECT.SUBJECT_ID)*18/120) AS PAYMENT_PER_SUBJECT,
  SUM(0.4*NUMBER_OF_CREDITS*PERCENT*(
    SELECT COUNT(STUDENTID) 
    FROM SUBJSTUD
    WHERE SUBJSTUD.SUBJECTID = SUBJECT.SUBJECT_ID)*18/120) AS PAYMENT_PER_PROFESSOR
FROM SUBJECT, PROFESSOR, TEACHES
WHERE PROFESSOR.PROFESSOR_ID = TEACHES.PROFESSORID 
AND SUBJECT.SUBJECT_ID = TEACHES.SUBJECTID
AND POCETOK_UCEBNA = :UCEBNA_GODINA
AND SEMESTAR = :SEMESTAR
AND PROFESsOR.STUDISKAPROGRAMA = :STUDISKAPROGRAMA
GROUP BY PROFESSOR_NAME, SUBJECT_NAME, NUMBER_OF_CREDITS, PERCENT

参数取自列表框。没有SUM，它工作正常，但我需要最后的计算来生成一个报告，该报告将为每位教授的每个主题的所有付款总和。问题可能在子表达式（SELECT COUNT(STUDENTID) FROM SUBJSTUD WHERE SUBJSTUD.SUBJECTID = SUBJECT.SUBJECT_ID）中，但我不知道如何解决它。

Answer 1

您的查询中缺少开放括号，请尝试：

SELECT PROFESSOR_NAME, SUBJECT_NAME, NUMBER_OF_CREDITS, PERCENT,
  (SELECT COUNT(STUDENTID)
    FROM SUBJSTUD
    WHERE SUBJSTUD.SUBJECTID = SUBJECT.SUBJECT_ID) AS NUMBER_OF_STUDENTS,
  (0.4*NUMBER_OF_CREDITS*PERCENT*(
    SELECT COUNT(STUDENTID)
    FROM SUBJSTUD
    WHERE SUBJSTUD.SUBJECTID = SUBJECT.SUBJECT_ID)*18/120) AS PAYMENT_PER_SUBJECT,
  SUM(0.4*NUMBER_OF_CREDITS*PERCENT*(
    SELECT COUNT(STUDENTID) 
    FROM SUBJSTUD
    WHERE SUBJSTUD.SUBJECTID = SUBJECT.SUBJECT_ID)*18/120) AS PAYMENT_PER_PROFESSOR
FROM SUBJECT, PROFESSOR, TEACHES
WHERE PROFESSOR.PROFESSOR_ID = TEACHES.PROFESSORID 
AND SUBJECT.SUBJECT_ID = TEACHES.SUBJECTID
AND POCETOK_UCEBNA = :UCEBNA_GODINA
AND SEMESTAR = :SEMESTAR
AND PROFESsOR.STUDISKAPROGRAMA = :STUDISKAPROGRAMA
GROUP BY PROFESSOR_NAME, SUBJECT_NAME, NUMBER_OF_CREDITS, PERCENT;

Oracle“不是GROUP BY表达式错误”

1 个答案: