Say I have a "persons" table, which has the following columns- "Firstname", 
"Lastname", "DateOfBirth".

Now assuming many different parts of the application display information 
from these three columns together. Is there a way I can define a function 
*persons.information 
*that returns the concatenation of these columns? 


Similarly, say the persons table also has an age column, and my application 
assigns groups to different age groups (A= 1-10, B= 11-20, F=51-60 etc).

Can I define a function called *persons.age_group *that returns the group 
ID?

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