Tuple and domain calculus

In these calculus's (databse calculus), how do you deal with if statements?
JCW2Asked:
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derekkrommConnect With a Mentor Commented:
can you give an example?

typically, when you're writing a query and you need to have an "if" on a specific column, there's a function that allows you to do that

in access, you can do iif(<if statement>, <true value>, <false value>)
in sql server, you can do case when <if statement=true> then <do stuff> else <do other stuff> end

etc
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JCW2Author Commented:
Thank you for your help.
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