需要帮忙MERGE语句工作

Question

我的SQL Anywhere的12.0.1数据库有两个表：

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＃编写）进行批量复制成ListDetailsLoad表，然后运行存储过程。存储过程的工作是将数据移动到ListDetails表中。这里的存储过程：

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; 

这个编译好。问题是，当我运行它，我得到以下错误信息：

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. 

如何解决MERGE语句？

Answer 1

它告诉你问题是什么。 :)

在您的UPDATE声明的左侧，没有关联名称，并且它不知道要更新哪个ListDetailId。这应该工作：

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;