https://learn.microsoft.com/ja-jp/dotnet/api/system.data.sqltypes.sqldecimal?view=netframework-4.8.1&viewFallbackFrom=net-8.0
SqlDecimal Struct (System.Data.SqlTypes) | Microsoft Learn
Represents a numeric value between - 10^38 +1 and 10^38 - 1, with fixed precision and scale.
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