使用MERGE的算术溢出错误(数字到数字):SQL Server错误？

Question

我有一个TargetTable有DECIMAL(20, 7)列的目标表.我也有一个SourceTable包含DECIMAL(20, 7)列的源表,但是这个表中的值都是整数.

当我尝试将数据UPSERT成TargetTable从SourceTable通过MERGE声明,我得到一个标准错误.

算术溢出错误将数字转换为数据类型数字.

我真的不明白为什么会发生这种情况,因为两种数据类型都是相同的.

但奇怪的是:当我使用SELECT INTOon TargetTable来创建测试表TestTable,然后将合并的目标更改为TestTable,upsert完成.我也弄不明白为什么会是这样,因为TargetTable和TestTable是大部分相同.

有没有人遇到过这个,这是一个错误,还是有一些我不知道的SQL Server的细微差别？

---

示例代码:

失败:

SET NUMERIC_ROUNDABORT Off
GO

MERGE
    TargetTable Target
USING
    (
        SELECT
            cast(forecast as DECIMAL(20, 7)) forecast
          ,[SegmentID]
          ,[Country]
          ,[Environment]
          ,[YearColumn]
          ,[ForecastYear]
          ,[Criterion]
        FROM
            SourceTable
    ) Source
    ON
    (
        Target.SegmentID = Source.SegmentID
        AND Target.Country = Source.Country
        AND Target.Environment = Source.Environment
        AND Target.YearColumn = Source.YearColumn
        AND Target.ForecastYear = Source.ForecastYear
        AND Target.Criterion = Source.Criterion
    )
WHEN NOT MATCHED BY TARGET AND Source.Forecast <> 0 AND Source.Forecast IS NOT NULL THEN
    INSERT (SegmentID, Country, Environment, YearColumn, Forecast, ForecastYear, Criterion)
    VALUES (Source.SegmentID, Source.Country, Source.Environment, Source.YearColumn, Source.Forecast, Source.ForecastYear, Source.Criterion)
WHEN MATCHED AND (Source.Forecast = 0 OR Source.Forecast IS NULL) THEN
    DELETE
WHEN MATCHED AND Source.Forecast <> Target.Forecast THEN
    UPDATE SET Target.Forecast = Source.Forecast;

成功:

SELECT
    *
INTO
    TestTable
FROM
    TargetTable
GO

SET NUMERIC_ROUNDABORT Off
GO

MERGE
    TestTable Target
USING
    (
        SELECT
            cast(forecast as DECIMAL(20, 7)) forecast
          ,[SegmentID]
          ,[Country]
          ,[Environment]
          ,[YearColumn]
          ,[ForecastYear]
          ,[Criterion]
        FROM
            SourceTable
    ) Source
    ON
    (
        Target.SegmentID = Source.SegmentID
        AND Target.Country = Source.Country
        AND Target.Environment = Source.Environment
        AND Target.YearColumn = Source.YearColumn
        AND Target.ForecastYear = Source.ForecastYear
        AND Target.Criterion = Source.Criterion
    )
WHEN NOT MATCHED BY TARGET AND Source.Forecast <> 0 AND Source.Forecast IS NOT NULL THEN
    INSERT (SegmentID, Country, Environment, YearColumn, Forecast, ForecastYear, Criterion)
    VALUES (Source.SegmentID, Source.Country, Source.Environment, Source.YearColumn, Source.Forecast, Source.ForecastYear, Source.Criterion)
WHEN MATCHED AND (Source.Forecast = 0 OR Source.Forecast IS NULL) THEN
    DELETE
WHEN MATCHED AND Source.Forecast <> Target.Forecast THEN
    UPDATE SET Target.Forecast = Source.Forecast;

Answer 1

您的代码似乎根本没有错误.此外,当您使用与原始表显示错误不存在的相同结构和数据时,它在您创建另一个表作为目标时工作正常.最可能的原因是您的原始表上有一个触发器正在执行失败的查询,这就是您所看到的错误.