Cr9.0

in my pageheader , got country and cityname.
below it, is a section that has district as a group.
below it, is detail section with game field in it.
query:
select country, CityName, district,
case when (population > 200) then game else null end
from country, province, city
group CityName, district
my problem is how to suppress the page header when game is null.You can conditionaly suppress your Page Header (or a PH section).
In the Section Expert, check the Suppress option for your PageHeader, click the 'x+2' button and print such a formula:

Count({table.game},{table.district})=0