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Any float value less than 5E-18 (when set using either the scientific notation of 5E-18 or the decimal notation of 0.0000000000000000050000000000000005) rounds down to 0. Prior to SQL Server 2016 (13.x), conversion of float values to decimal or numeric is restricted to values of precision 17 digits only. Loss of only precision and scale isn't sufficient to raise an error. Conversely, if the SET ARITHABORT option is ON, SQL Server raises an error when overflow occurs. Converting from int, smallint, tinyint, float, real, money, or smallmoney to either decimal or numeric can cause overflow.īy default, SQL Server uses rounding when converting a number to a decimal or numeric value with a lower precision and scale.
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For example, the constant 12.345 is converted into a numeric value with a precision of 5 and a scale of 3.Ĭonverting from decimal or numeric to float or real can cause some loss of precision. In Transact-SQL statements, a constant with a decimal point is automatically converted into a numeric data value, using the minimum precision and scale necessary. For example, decimal(5,5) and decimal(5,0) are considered different data types. Converting decimal and numeric dataįor decimal and numeric data types, SQL Server considers each combination of precision and scale as a different data type. Informatica (connected through the SQL Server PDW Informatica Connector) only supports 16 significant digits, regardless of the precision and scale specified.