需要幫忙MERGE語句工作

Question

我的SQL Anywhere的12.0.1數據庫有兩個表：

CREATE TABLE "ListDetails" (
    ListDetailId UNIQUEIDENTIFIER NOT NULL PRIMARY KEY, 
    ListId   UNIQUEIDENTIFIER NOT NULL, 
    CountryId  VARCHAR(3)   NULL REFERENCES "Countries"  (CountryId) DEFAULT 'USA', 
    LocaleCode  VARCHAR(3)   NULL REFERENCES "Locales"  (LocaleCode), 
    Plate   VARCHAR(50)   NULL, 
    HashedPlate  UNIQUEIDENTIFIER NULL, 
    AlarmClassId INT     NULL REFERENCES "AlarmClasses" (AlarmClassId), 
    BeginDate  DATETIME   NULL, 
    EndDate   DATETIME   NULL, 
    ListPriorityId INT     NULL REFERENCES "ListPriorities" (ListPriorityId), 
    VehicleTypeId INT     NULL REFERENCES "VehicleTypes" (VehicleTypeId), 
    PlateClassId INT     NULL REFERENCES "PlateClasses" (PlateClassId), 
    MakeId   INT     NULL REFERENCES "VehicleBrands" (VehicleBrandId), 
    ModelId   INT     NULL REFERENCES "VehicleModels" (VehicleModelId), 
    "Year"   INT     NULL, 
    ColorId   INT     NULL REFERENCES "VehicleColors" (VehicleColorId), 
    Notes   VARCHAR(8000)  NULL, 
    OfficerNotes VARCHAR(8000)  NULL, 
    IsNewRow  BIT     NOT NULL DEFAULT '1', 
    CreatedDate  DATETIME   NOT NULL DEFAULT NOW(), 
    i_active  SMALLINT   NOT NULL DEFAULT 1, 
    ModifyDate  DATETIME   NULL, 
    Subscriber  UNIQUEIDENTIFIER NULL, 
    FromToVersion BIGINT    NOT NULL, 
    FromVersion  BIGINT, 
    InstanceId  UNIQUEIDENTIFIER NOT NULL UNIQUE 
); 

和：

CREATE GLOBAL TEMPORARY TABLE "ListDetailsLoad" ( 
    ListDetailId UNIQUEIDENTIFIER NOT NULL, 
    ListId   UNIQUEIDENTIFIER NOT NULL, 
    CountryId  VARCHAR(3)   NULL, 
    LocaleCode  VARCHAR(3)   NULL, 
    Plate   VARCHAR(50)   NULL, 
    HashedPlate  UNIQUEIDENTIFIER NULL, 
    AlarmClassId INT     NULL, 
    BeginDate  DATETIME   NULL, 
    EndDate   DATETIME   NULL, 
    ListPriorityId INT     NULL, 
    VehicleTypeId INT     NULL, 
    PlateClassId INT     NULL, 
    MakeId   INT     NULL, 
    ModelId   INT     NULL, 
    "Year"   INT     NULL, 
    ColorId   INT     NULL, 
    Notes   VARCHAR(8000)  NULL, 
    OfficerNotes VARCHAR(8000)  NULL, 
    Subscriber  UNIQUEIDENTIFIER NULL, 
    InstanceId  UNIQUEIDENTIFIER NOT NULL 
) NOT TRANSACTIONAL; 

我的程序（用C＃編寫）進行批量複製成ListDetailsLoad表，然後運行存儲過程。存儲過程的工作是將數據移動到ListDetails表中。這裏的存儲過程：

MERGE INTO "ListDetails" AS dst 
USING "ListDetailsLoad" AS src 
ON dst.ListDetailId = src.ListDetailId 
WHEN MATCHED THEN UPDATE 
    SET ListDetailId = src.ListDetailId, 
     ListId   = src.ListId, 
     CountryId  = src.CountryId, 
     LocaleCode  = src.LocalCode, 
     Plate   = src.Plate, 
     HashedPlate  = src.HashedPlate, 
     AlarmClassId = src.AlarmClassId, 
     BeginDate  = src.BeginDate, 
     EndDate   = src.EndDate, 
     ListPriorityId = src.ListPriorityId, 
     VehicleTypeId = src.VehicleType, 
     PlateClassId = src.PlateClassId, 
     MakeId   = src.MakeId, 
     ModelId   = src.ModelId, 
     "Year"   = src."Year", 
     ColorId   = src.ColorId, 
     Notes   = src.Notes, 
     OfficerNotes = src.OfficerNotes, 
     ModifyDate  = NOW(), 
     FromToVersion = dbVersion.NEXTVAL, 
     FromVersion  = NULL, 
     Subscriber  = src.Subscriber, 
     InstanceId  = src.InstanceId 
    WHEN NOT MATCHED THEN INSERT 
     (ListDetailId, ListId,  CountryId, LocaleCode,  Plate,   HashedPlate, 
      AlarmClassId, BeginDate,  EndDate, ListPriorityId, VehicleTypeId, PlateClassId, 
      MakeId,  ModelId,  "Year",  ColorId,  Notes,   OfficerNotes, 
      ModifyDate, FromToVersion, Subscriber, FromVersion, InstanceId) 
    VALUES 
     (src.ListDetailId, src.ListId,  src.CountryId, src.LocaleCode,  src.Plate,   src.HashedPlate, 
      src.AlarmClassId, src.BeginDate,  src.EndDate, src.ListPriorityId, src.VehicleTypeId, src.PlateClassId, 
      src.MakeId,  src.ModelId,  src."Year",  src.ColorId,  src.Notes,   src.OfficerNotes, 
      NOW(),   dbVersion.NEXTVAL,  NULL,  src.Subscriber, src.InstanceId); 

    TRUNCATE TABLE "ListDetailsLoad"; 
END; 

這個編譯好。問題是，當我運行它，我得到以下錯誤信息：

Could not execute statement. Column "ListDetailId" found in more than one table or it is used more than once in the SELECT list -- it needs a correlation name. 

如何解決MERGE語句？

Answer 1

它告訴你問題是什麼。 :)

在您的UPDATE聲明的左側，沒有關聯名稱，並且它不知道要更新哪個ListDetailId。這應該工作：

USING "ListDetailsLoad" AS src 
ON dst.ListDetailId = src.ListDetailId 
WHEN MATCHED THEN UPDATE 
    SET dst.ListDetailId = src.ListDetailId, 
     dst.ListId   = src.ListId, 
     dst.CountryId  = src.CountryId, 
     dst.LocaleCode  = src.LocalCode, 
     dst.Plate   = src.Plate, 
     dst.HashedPlate  = src.HashedPlate, 
     dst.AlarmClassId = src.AlarmClassId, 
     dst.BeginDate  = src.BeginDate, 
     dst.EndDate   = src.EndDate, 
     dst.ListPriorityId = src.ListPriorityId, 
     dst.VehicleTypeId = src.VehicleType, 
     dst.PlateClassId = src.PlateClassId, 
     dst.MakeId   = src.MakeId, 
     dst.ModelId   = src.ModelId, 
     dst."Year"   = src."Year", 
     dst.ColorId   = src.ColorId, 
     dst.Notes   = src.Notes, 
     dst.OfficerNotes = src.OfficerNotes, 
     dst.ModifyDate  = NOW(), 
     dst.FromToVersion = dbVersion.NEXTVAL, 
     dst.FromVersion  = NULL, 
     dst.Subscriber  = src.Subscriber, 
     dst.InstanceId  = src.InstanceId 
    WHEN NOT MATCHED THEN INSERT 
     (ListDetailId, ListId,  CountryId, LocaleCode,  Plate,   HashedPlate, 
      AlarmClassId, BeginDate,  EndDate, ListPriorityId, VehicleTypeId, PlateClassId, 
      MakeId,  ModelId,  "Year",  ColorId,  Notes,   OfficerNotes, 
      ModifyDate, FromToVersion, Subscriber, FromVersion, InstanceId) 
    VALUES 
     (src.ListDetailId, src.ListId,  src.CountryId, src.LocaleCode,  src.Plate,   src.HashedPlate, 
      src.AlarmClassId, src.BeginDate,  src.EndDate, src.ListPriorityId, src.VehicleTypeId, src.PlateClassId, 
      src.MakeId,  src.ModelId,  src."Year",  src.ColorId,  src.Notes,   src.OfficerNotes, 
      NOW(),   dbVersion.NEXTVAL,  NULL,  src.Subscriber, src.InstanceId); 

    TRUNCATE TABLE "ListDetailsLoad"; 
END;