SQL子查詢表達式

Question

SELECT  
    list_diagnosis_seq, list_diagnosis_icd10, 
    list_diagnosis_disease, list_diagnosis_diagtype
FROM    
    cmu_list_diagnosis, cmu_treatment
WHERE   
    (cmu_list_diagnosis.list_diagnosis_date = (SELECT MAX(list_diagnosis_date)  
                                               FROM cmu_list_diagnosis))
    AND cmu_list_diagnosis.treatment_id = (SELECT cmu_list_diagnosis.treatment_id
                                           FROM cmu_list_diagnosis, cmu_treatment 
                                           WHERE cmu_treatment.treatment_date = current_date
                                             AND cmu_treatment.patient_id = (SELECT cmu_patient.patient_id
                                                                             FROM cmu_patient, cmu_treatment
                                                                             WHERE cmu_patient.patient_id = cmu_treatment.patient_id));

我認為是錯的

如何使此代碼正確？

謝謝大家:)

Answer 1

AND cmu_list_diagnosis.treatment_id =（從cmu_list_diagnosis，cmu_treatment中選擇cmu_list_diagnosis.treatment_id WHERE cmu_treatment.treatment_date =當前日期AND cmu_treatment.patient_id =（選擇cmu_ Patient。Patient_id

在上面的兩個“選擇”引用中，都使用“前1個”或“使用IN”（選擇...而不是“ =選擇”

Answer 2

在不知道您的特定錯誤或DBMS的情況下，此翻譯可能會幫助您：

SELECT ListDiagnosis.list_diagnosis_seq
    ,ListDiagnosis.list_diagnosis_icd10
    ,ListDiagnosis.list_diagnosis_disease
    ,ListDiagnosis.list_diagnosis_diagtype
FROM cmu_list_diagnosis AS ListDiagnosis
INNER JOIN cmu_treatment AS Treatment ON Treatment.treatment_id = ListDiagnosis.treatment_id
    AND Treatment.treatment_date = CURRENT_DATE
INNER JOIN cmu_patient AS Patient ON Patient.patient_id = Treatment.patient_id
WHERE ListDiagnosis.list_diagnosis_date = (
    SELECT MAX(list_diagnosis_date) AS MaxDate
    FROM cmu_list_diagnosis
);

這會將您的語法轉換為ANSI語法，從而消除了子查詢的雙重嵌套。 INNER JOINs應該提供您要查找的篩選，並且WHERE子句子查詢中日期的別名應消除某些數據庫（例如Teradata）將引發的錯誤。