Question

我在我的merge语句中注意到，源表中有PackageId为0的行。这些记录不应插入到目标表中。所以我想在我的INSERT上设置这种条件。

MERGE MyTargetTable AS TARGET
USING MySourceTable AS SOURCE
ON (SOURCE.orderidHash = TARGET.Id)
WHEN MATCHED AND (TARGET.CustomerId <> SOURCE.CustomerId
    OR TARGET.PackageId <> SOURCE.packageid
    OR TARGET.TypeId <> SOURCE.ordertypeid
    OR TARGET.Created <> SOURCE.Created
    OR TARGET.Updated <> SOURCE.Changed)
THEN
UPDATE SET TARGET.CustomerId = SOURCE.customeridHash,
     TARGET.PackageId = SOURCE.packageid,
     TARGET.TypeId = SOURCE.ordertypeid,
     TARGET.Created = SOURCE.Created,
     TARGET.Updated = SOURCE.Changed
WHEN NOT MATCHED BY TARGET 
INSERT (
    Id, 
    CustomerId, 
    PackageId,
    TypeId,
    Created, 
    Updated
)
VALUES (
    SOURCE.orderidHash,
    SOURCE.customeridHash,
    SOURCE.packageid,
    SOURCE.ordertypeid,
    SOURCE.Created,
    SOURCE.changed
)
WHEN NOT MATCHED BY SOURCE THEN DELETE;

在上述声明中，我应该在哪里WHERE PackageId <> 0？当我将条件放在WHEN NOT MATCHED BY TARGET之后时，我收到错误消息：

MERGE语句与FOREIGN KEY约束“ FK_MyTargetTable_DimCustomer”冲突。数据库MyDatabase的表DimCustomer的列ID中发生了冲突。

MyTargetTable.CustomerId是DimCustomer.Id的FK。

Answer 1

只需更改

USING MySourceTable AS SOURCE
to
using (select * from MySourceTable where  PackageId <> 0) as Source

使用条件INSERT

1 个答案: