'LIKE' operator in Relations

What does the ‘LIKE’ operator in Relations? I can’t seem to find it in Help or other documentation. (It’s possible I’m just not looking in the right place.)

The Like-Operator generates a LIKE Sql statement. That gives you the possibilty to search for substrings. A

select * from people where first_name LIKE ‘%ete%’

will find for example ‘Peter’.