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# MySQL | HEX method

schedule Aug 12, 2023
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MySQL
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MySQL's HEX(~) method returns a hexadecimal representation of the input argument.

NOTE

Hexadecimal is base 16, where there are 16 digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, and F. A through F in hexadecimal is 10 through 15 in decimal notation.

# Parameters

1. str or N | string or number

The string or number to return hexadecimal string representation for.

# Return value

Input

Return value

String

each byte of each character in the string is converted to two hexadecimal digits.

Number

representation of the number converted to base 16. This is equivalent to CONV(number, 10, 16).

# Examples

## String argument

To return hexadecimal representation of 'Apple':

 SELECT HEX('Apple'); +--------------+| HEX('Apple') |+--------------+| 4170706C65 |+--------------+ 

Note that 'A' has the byte value of 65. In hexadecimal we can see this is represented as '41'.

\begin{align} 4(16^1) + 1(16^0) &= 64 + 1 \\ &=65 \\ \end{align}

## Numeric argument

To verify that HEX(30) and CONV(30, 10, 16) are equivalent:

 SELECT HEX(30), CONV(30, 10, 16); +---------+------------------+| HEX(30) | CONV(30, 10, 16) |+---------+------------------+| 1E | 1E |+---------+------------------+ 
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