Here’s a common task: You need to create a database user with read only access. You have some power users who know how to use SQL, and they are allowed to see all of the data in the system. You can use these commands to create such a user (in Oracle):
create user PSRO identified by PSRO;
grant create session, select any table, select any dictionary to PSRO;
Note: You can probably find this all over the web, but I wanted to capture it on my blog so that I could find the syntax easier.