Calculate MD5 checksum. This function returns the MD5 hash of a string as a 32-character hexadecimal number.
MD5(str)Calculates an MD5 128-bit checksum for the string.
The return value is a 32-hex digit string, and a nonbinary string in the connection , determined by the values of the and system variables.
NULL is returned if the argument was NULL.
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SELECT MD5('testing');
+----------------------------------+
| MD5('testing') |
+----------------------------------+
| ae2b1fca515949e5d54fb22b8ed95575 |
+----------------------------------+