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我正在做一個任務,並試圖弄清楚我的聲明給了我一個ORA-00904:「SUBLOC」:無效標識符錯誤。我可以不使用MOD運算符中的別名字段嗎?任何幫助將不勝感激。SUBSTR&MOD無效標識符
SELECT Course_no, Location, TO_NUMBER(SUBSTR(Location,2)) AS Subloc
FROM Section
WHERE Location LIKE '%M%'
AND MOD(SubLoc,2) = 1
ORDER BY Course_no;