The simplest Lightweight Directory Access Protocol (LDAP) filter is (attributeName operator value)—for example, (cn=John Calvin). In addition to the equals (=) operator, you can use the greater than or equal to value (>=) operator and the less than or equal to value (<=) operator. You can use the wildcard character, an asterisk (*), for wildcard comparisons such as (cn=John*) or (cn=*amy*). For example, (telephoneNumber=*) returns all objects where the telephoneNumber attribute has been set.

What if you ...