What SQL Server Data Type Should I Use for C# Double Properties?

Choosing the Appropriate SQL Server Data Type for Double

When mapping C# double properties to an SQL Server database table, it's crucial to select the most appropriate data type to preserve the accuracy and precision of the stored values. While there isn't an explicit double type in SQL Server, you have the options of decimal and float.

Float vs. Decimal

• Decimal: Represents exact decimal numbers, useful when absolute precision is required. It can define the number of digits before and after the decimal point.
• Float: Represents floating-point numbers, which can approximate real values. It uses a binary floating-point format.

Recommendation

In scenarios where accurate floating-point values are essential, such as latitude and longitude, float is the preferred choice in SQL Server. It is comparable to the double type in C# and provides a significant resolution of 53-bit mantissa.

Additional Notes

• float(24) or real, representing a 24-bit mantissa, may suffice for storing latitude and longitude with one-meter precision.
• float(53) and float are equivalent in terms of binary representation and precision.
• C# float is only 32-bit and corresponds to the real/float(24) type in SQL Server.

Ultimately, the appropriate data type depends on the precision and accuracy requirements of the stored values. For latitude and longitude, float is suitable for maintaining sufficient resolution while avoiding unnecessary decimal places.

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