Question

当我尝试运行以下语句时，我一直收到“找不到预期的FROM关键字”错误指向第1行：

SELECT Physician.Last_Name, Physician.First_Name, (SELECT COUNT (DISTINCT Patient_ID)), AS Unique_PTS
FROM Visit
JOIN Physician
          ON Visit.Physician_ID = Physician.Physician_ID
GROUP BY Physician.Last_Name, Physician.First_Name
ORDER BY Unique_PTS DESC;

该错误特别突出显示Patient_ID))，我无法弄清楚修复。

Answer 1

它是（SELECT COUNT（DISTINCT patient_id）），奇怪的是，它没有FROM关键字:-)。我认为你真的应该丢失SELECT并且只有COUNT（DISTINCT patient_id）。

SELECT Physician.Last_Name, Physician.First_Name, COUNT (DISTINCT Patient_ID) AS Unique_PTS
FROM Visit
JOIN Physician
          ON Visit.Physician_ID = Physician.Physician_ID
GROUP BY Physician.Last_Name, Physician.First_Name
ORDER BY Unique_PTS DESC;

Oracle SQL“找不到FROM关键字”

1 个答案: