Example
Suppose phone_number is a nullable integer column whose value is null. If you issued the following print statements:
.nullstring 'N/A'
.print ' Phone number = ', phone_number .nl
.nullstr '?'
.print 'Phone number = ', phone_number .nl
Report-Writer would print the following if the value of phone‑number were null:
Phone number = N/A
Phone number = ?