我想爲下表只返回一條記錄,但不工作。它返回多個record.Please指教,謝謝SQL Group按日期只選擇1條記錄
我懷疑與GROUPBY
CreateDate Firstname EventID
2013-05-13 18:11:35.187 Jack 0CD7B08A-0EAF-4515-9DE1-00FC6DB29A61
2013-05-13 18:11:35.310 Paul 16A584D5-E9B7-4617-8DC9-089C628E0ED5
2013-05-13 20:14:33.863 Craig AAA21035-1377-443D-9BEE-0C0761534803
這裏的問題是上述結果的SQL查詢:
SELECT MAX (CreateDate) AS Create_Date, Firstname ,EventID
FROM SessionsEvents
WHERE TRN='0391588'
GROUP BY Firstname , TRN, EventID
爲什麼你期望只有一個記錄? – akonsu
一些列丟失,ClinicianName,ConsumerHRN和TRN在哪裏? –
我道歉的傢伙,我正在複製錯誤的SQL。它是sql服務器查詢。謝謝 – Spidey