Build SQL Search String

I am creating a search page and need help writing the code to build the sql
string.

I have 3 fields on the main page which a user can choose to enter search
terms in any of the 3 fields. My question is how do I write the logic so it
only includes the fields in the search criteria where the user has entered
anything.

Fields are

Production No
Production Title
Synopsis

The user may enter any, all or some of the search teams in the fields.

On the search page I am using lots of if conditions to build my sql string
like

strSQL = "Select * from Productions where "

now after where there are lots of permutations and combination like
production no could be empty or it could be filled in and the other fields
might be empty or filled in as well.

Does someone has a simple logic to build the correct sql String?

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