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我想写一个查询来检索只存在于一个表中的数据,我还有其他需要解决的参数我研究了这个语法,但我不明白为什么我的其他参数参数没有被使用。对不起,如果这篇文章看起来相当缺乏经验,我只用了一个月的SQL。SQL不存在包含多个参数
/*List the patient id, primary diagnosis and attending physician id for current admissions (no discharge date) in ICU
who haven't had an encounter with their attending physician.*/
PRINT 'GROUP 5 SELECT A';
PRINT '';
SELECT Admissions.PatientID, Admissions.PrimaryDiagnosis, Admissions.AttendingPhysicianID
FROM Admissions
WHERE NOT EXISTS
(SELECT *
FROM Encounters
WHERE (Admissions.PatientID = Encounters.PatientID)) And (Admissions.DischargeDate is NULL) And (Admissions.NursingUnitID = 'ICU');
我怀疑'(Admissions.DischargeDate是否为NULL)'和'(Admissions.NursingUnitID ='ICU')'应该在子查询内,但我'不确定,因为很难弄清楚什么是逻辑应该是完全的。 – GolezTrol
我如何编写我的语法以将它们放在子选择之外? –
删除最后一个'''并放在'(Admissions.PatientID = Encounters.PatientID)'之后。 – GolezTrol