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MySQL - UNHEX() Function
The MySQL UNHEX() function is used to convert a hexadecimal string representation to its original binary data form.
The UNHEX() function can be useful in scenarios such as decoding data that was encoded using the HEX() function, converting hexadecimal values back to their original binary format, etc.
Syntax
Following is the syntax of MySQL UNHEX() function −
UNHEX(val);
Parameters
This function accepts a hexadecimal string as a parameter.
Return Value
This function returns the binary representation as a string of the given hexadecimal value.
Example
In the following example, we are converting the hexadecimal string representation "4D" to its original binary data form −
SELECT UNHEX('4D');
Following is the output of the above code −
UNHEX('4D') |
---|
0x4D |
If you disable the --binary-as-hex value, the result of the above query will be as follows −
SELECT UNHEX('4D');
The result produced is as follows −
UNHEX('4D') |
---|
M |
Example
If you pass a non-hexadecimal value as an argument to UNHEX(), it returns NULL −
SELECT UNHEX('non-hexadecimal-string');
The output obtained is as follows −
UNHEX('non-hexadecimal-string') |
---|
NULL |
Example
In the following example, we are performing the UNHEX operation on the HEX value of "test123". It converts the hexadecimal representation of "test123" back to its original form −
SELECT UNHEX(HEX('test123'));
We get the output as follows −
UNHEX(HEX('test123')) |
---|
test123 |
Example
You can also convert the values of a columns from hexa-decimal from binary using the UNHEX() function.
Let us create a table named "EMP" and insert records into it using CREATE and INSERT statements as shown below −
CREATE TABLE EMP( NAME CHAR(20) NOT NULL, AGE INT, INCOME FLOAT );
Now, let us insert records into it using the INSERT statement −
INSERT INTO EMP VALUES ('52616a75', 19, 2000), ('5261686d616e', 20, 7000), ('526f62657274', 25, 5000);
The EMP obtained is as follows −
NAME | AGE | INCOME |
---|---|---|
52616a75 | 19 | 2000 |
5261686d616e | 20 | 7000 |
526f62657274 | 25 | 5000 |
Following query converts the values of the NAME column from hexa-decimal string to binary −
SELECT NAME, AGE, INCOME UNHEX(NAME) FROM EMP;
After executing the above code, we get the following output −
NAME | AGE | INCOME | UNHEX(NAME) |
---|---|---|---|
52616a75 | 19 | 2000 | Raju |
5261686d616e | 20 | 7000 | Rahman |
526f62657274 | 25 | 5000 | Robert |
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