How to Convert Integers to Hex and Vice Versa in SQL Server?

Converting Integers to Hex and Vice Versa in SQL Server

When dealing with integer-to-hex and hex-to-integer conversions, SQL Server differs from other database management systems. Here's how to accomplish these tasks in Microsoft SQL Server:

Converting Integer to Hex

To convert an integer to hexadecimal in SQL Server, use the CONVERT function:

SELECT CONVERT(VARBINARY(8), int_field);

For example:

SELECT CONVERT(VARBINARY(8), 16777215); -- Result: 0xFFFFFF

Converting Hex to Integer

Similarly, you can convert hexadecimal strings to integers using the CONVERT function:

SELECT CONVERT(INT, hex_field);

For example:

SELECT CONVERT(INT, 0xFFFFFF); -- Result: 16777215

Dealing with Hexadecimal Strings

If the hexadecimal value is stored as a string, consider the following:

• If the string starts with the '0x' marker, use:

SELECT CONVERT(INT, CONVERT(VARBINARY, '0x1FFFFF', 1));

• If the string does not have the '0x' marker, use:

SELECT CONVERT(INT, CONVERT(VARBINARY, '1FFFFF', 2));

Note that the string must contain an even number of hex digits.

Additional Considerations

• Use the CAST function for converting integer literals to hexadecimal.
• For more details on binary styles, refer to the "Binary Styles" section in the Microsoft documentation for CAST and CONVERT.
• SQL Server 2008 or later is recommended for these conversion methods.

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