MySQL column that auto generates data, longer than UUID

My friend has the problem as shown below. He asked at StackOverFlow and there is no reply yet till now so I wish to help him to try the luck here. Thanks for everyone that helps. "I would like to ask if its possible to set up a database table that has a column that auto generates random alphanumerical data that is longer that what UUID can do. I've been using UUID for a while now but I would like to have a longer string of random data in my columns, something similar to that of a token authenticator (around 300+ characters). So when I insert values in columns, this particular column will auto generate data by itself. Thanks in advance." Quoted from Reuben Tan Source: https://stackoverflow.com/questions/43461771/mysql-column-that-auto-generates-data-longer-than-uuid