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# MySQL | UNHEX method

schedule Aug 10, 2023
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MySQL's `UNHEX(~)` method returns a binary string from the hexadecimal string representation. For strings, `UNHEX(~)` is the inverse of the `HEX(~)` method.

For numeric arguments, the inverse of `HEX(~)` is performed by `CONV(hexadecimal, 16, 10)`

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` | `string`

The hexadecimal to return the binary string for.

# Return value

A binary string representation of the input hexadecimal string.

# Examples

To return a binary string from the hexadecimal string `'4170706C65'`:

``` SELECT UNHEX('4170706C65'); +---------------------+| UNHEX('4170706C65') |+---------------------+| Apple |+---------------------+ ```
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