ORA-00979：不是GROUP BY表達式錯誤

我的問題是，我必須顯示僱員的姓名和他們工作的會議數量。如果員工沒有直接在任何會議上工作，則必須爲該員工顯示0。與此查詢相關的表是：

Employee_C表：

EID NAME SALARY   MID 
--- -------------------- ----- 
e01 Wilson 53000 
e02 Smith  48000  e01 
e03 Jones  38000  e01 
e04 Loftus  41000 
e05 Fox  54000  e04 
e06 Smith  45000  e04 
e07 Green  48000 
e08 Fox   49000  e04 
e09 Wolf  41000  e04 
e10 Wang  32000  e01 
e11 Phillips 33000  e07 
e12 Liu   27000  e07

Deals_C表：

EID CONFID 
--- ------ 
e02 c00001 
e03 c00001 
e05 c00001 
e06 c00001 
e03 c00002 
e08 c00002 
e09 c00002 
e10 c00002 
e03 c00003 
e05 c00003 
e06 c00004 
e08 c00005 
e09 c00005 
e10 c00005 
e06 c00005 
e11 c00006 
e12 c00006 
e05 c00007 
e06 c00007 
e08 c00007 
e09 c00008 
e10 c00008 
e11 c00008 
e02 c00009 
e12 c00009 
e10 c00010 
e02 c00011 
e03 c00011 
e05 c00011 
e12 c00012 
e06 c00012

，我有SQL語句是

select E.Name, D.ConfID as "Number of Conferences" 
    from Employee_C E left outer join Deals_C D on E.eid = D.eid group by E.eid;

錯誤：

1號線選擇E.Name，D.ConfID作爲 * 錯誤「的會議數」： ORA-00979：不是GROUP BY表達式

請幫幫忙！謝謝

來源

2013-03-26 Navy

您錯過了一個聚合函數，並且您在SELECT列表中的列上沒有使用GROUP BY。你需要GROUP BY E.Name因爲該列是在選擇：

select E.Name, count(D.ConfID) as "Number of Conferences" 
from Employee_C E 
left outer join Deals_C D 
    on E.eid = D.eid 
group by E.Name;

見SQL Fiddle with Demo

來源

2013-03-26 18:16:04 Taryn

太感謝你了！ – Navy 2013-03-26 18:39:15

ORA-00979：不是GROUP BY表達式錯誤

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