SQL LIKE condition to check for integer?

Question

I am using a set of SQL LIKE conditions to go through the alphabet and list all items beginning with the appropriate letter, e.g. to get all books where the title starts wit

Answer 1

Assuming that you're looking for "numbers that start with 7" rather than "strings that start with 7," maybe something like

select * from books where convert(char(32), book_id) like '7%'

Or whatever the Postgres equivalent of convert is.