3

我有一个TargetTable包含一DECIMAL(20, 7)列的目标表。我也有一个SourceTable包含一DECIMAL(20, 7)列的源表，但是这个表中的值无论如何都是整数。

当我尝试通过语句将数据插入TargetTablefrom时，出现标准错误。SourceTableMERGE

将数字转换为数字数据类型的算术溢出错误。

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。

不过，奇怪的是：当我使用SELECT INTOonTargetTable创建一个 test table TestTable，然后将合并的目标更改为TestTable， upsert 完成。我也不明白为什么会这样，因为TargetTable和TestTable大部分是相同的。

以前有没有人遇到过这种情况，这是一个错误，还是我缺少 SQL Server 的一些模糊的细微差别？

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;
4

2 回答 2

9

Your code seems to have no error at all. Furthermore, the fact that it works fine when you create another table as the target, using the same structure and data that the original table shows that the error is not there. The most likely reason is that you have a trigger on your original table that is executing a query that fails, and that is the error you are seeing.

于 2012-06-07T15:16:52.063 回答
0

发生这种类型的错误是因为您可以将触发器与该特定表一起使用，但是该表上下文或数据库中执行了一些更改，因此它显示错误这种类型的错误，因此请禁用触发器并执行任务

于 2020-03-03T19:17:17.813 回答