postgresql - Postgres Automatically Generate Value for Field -


i have postgres table called users. table has these fields: 

user_id, first_name, last_name, email, user_code

is there way can have user_code field of table automatically generated in following format: initials of first_name , last_name in uppercase letters. in cases user_code should 2 characters long. however, if same code exists should add digit representing number user_code is? example if have user_code aj , add aj second aj should aj2 , third should aj3 , on. first should initials without numbers


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