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我寫這樣的查詢:
select employeeid,presenttime,count(latitude)
from mobilelocation
where presentdate='9-11-2011'
group by employeeid
order by presenttime desc
在執行此上面的查詢其示出像錯誤消息這個:
ORA-00979: not a GROUP BY expression.
這裏有什麼問題?