Compute The md5 Hash Of A String

One of the functions provided by PostgreSQL for working with string data is the md5() function. This function calculates the md5 hash of a given string.

It works like this:

> select md5('Hello, World!');
               md5
----------------------------------
 65a8e27d8879283831b664bd8b7f0ad4

> select md5('$3cr3tp4$$w0rd');
               md5
----------------------------------
 bbabecfd4031211077473734bae7249f

There are more hashing algorithms provided by the pgcrypto extension. See Compute Hashes With pgcrypto for more details on that.