Using Substring in MySQL criteria

Question

I\'m trying to fetch all instances where the 1st letter of a person\'s first name is equal to P.

This is what I came up with, which doesn\'t return anything:

Answer 1

The reason your expression doesn't work is that substring() positions are 1-based

Try either of these:

where FirstName like 'P%'

or

where substring(FirstName,1,1) = 'P'