Select Users Whose Last Name Falls in Alphabet Range

I have a page from which users can select to produce a PDF file of the attendance sheet.

I can select users by profession. I would like the user to also be able to narrow down each sign in sheet by first letter of last name. So they can select the letter A and the letter K to get all the people who signed up for the workshop whose last name's first letter falls in the range between A and K.

Any suggestions?
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Olaf DoschkeSoftware DeveloperCommented:
sql: select * from attendees where lower(left(lastname,1)) between 'a' and 'k'

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gianchi66Author Commented:
I guess it wasn't that hard... but I had never done it!
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