ORA-00979: 当 sum(col) 时不是 GROUP BY 表达式

【问题标题】：ORA-00979: not a GROUP BY expression when sum(col)ORA-00979: 当 sum(col) 时不是 GROUP BY 表达式
【发布时间】：2015-10-21 12:27:16
【问题描述】：

SELECT 
    INVOICEM.EMP_NO,
    EMPLOYEES.EMP_NAME,
    INVOICEM.INV_NO,
    SUM(INVOICEM.SUM_AMT),
    INVOICEM.SAL_DATE,
    INVOICEM.BRANCH
FROM INVOICEM JOIN EMPLOYEES
ON INVOICEM.EMP_NO = EMPLOYEES.EMP_NO
GROUP BY INVOICEM.EMP_NO,EMP_NAME

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【问题讨论】：

标签： oracle group-by sum

【解决方案1】：

oracle中只能选择group by语句或聚合函数中的字段：

SELECT INVOICEM.EMP_NO,EMPLOYEES.EMP_NAME,SUM(INVOICEM.SUM_AMT)
FROM INVOICEM JOIN EMPLOYEES
ON INVOICEM.EMP_NO = EMPLOYEES.EMP_NO
GROUP BY INVOICEM.EMP_NO,EMP_NAME

【讨论】：