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hex_decode_string

Description​

This function performs the opposite operation of hex().

It interprets each pair of hexadecimal digits in the input string as a number and converts it to the byte represented by the number. The return value is a binary string.

This function is supported from v3.0.

Syntax​

hex_decode_string(str);

Parameters​

str: the string to convert. The supported data type is VARCHAR. An empty string is returned if any of the following situations occur:

  • The length of the string is 0 or the number of characters in the string is an odd number.
  • The string contains characters other than [0-9], [a-z], and [A-Z].

Return value​

Returns a value of the VARCHAR type.

Examples​

mysql> select hex_decode_string(hex("Hello StarRocks"));
+-------------------------------------------+
| hex_decode_string(hex('Hello StarRocks')) |
+-------------------------------------------+
| Hello StarRocks                           |
+-------------------------------------------+

Keywords​

HEX_DECODE_STRING