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SELECT Distinct visitid As Visit_ID, 
       AreaId->FacilityID As Facility_ID, 
       visitid-PatientSecondaryNumber As Patient_MRN, 
       visitid->PatientName As Patient_Name, 
       visitid-statustext As visit_Status, 
       visitid->LastVisitTypeID->shortname As visit_Type,
       visitid-LastVisitActivationTime As Last_Visit_Activation,
       (SELECT VisitConversionID->VisitTypeID-shortname 
        FROM qcpr_arf_OC.VisitActivationTime 
        WHERE visitid = qcpr_arf_RG.AreaBedHistoryEventTime.visitid AND 
              VisitConversionID->VisitTypeID-shortname LIKE 'Emergency%' ) AS Last_Visit FROM qcpr_arf_rg.AreaBed INNER JOIN qcpr_arf_RG.AreaBedHistoryEventTime ON     
       qcpr_arf_rg.AreaBed.AreaBedID = qcpr_arf_RG.AreaBedHistoryEventTime.AreaBedID 
WHERE AreaBedHistoryEventTimeSubID LIKE 'Ç910%' AND visitid <> ''

こんにちは、上記のクエリは以前の従業員によって保持されており、「->」が何を意味するのかを理解しようとしています。誰か助けてください。

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-> 構文は暗黙の結合です。詳細な説明については、 http://docs.intersystems.com/cache20141/csp/docbook/DocBook.UI.Page.cls?KEY=GSQL_specialfeatures#GSQL_specialfeatures_impjoinを参照してください。

于 2014-08-04T10:58:22.020 に答える