open database opt;
#testcase 
sql select count(*)
    from [staedte as s, plz as p]
    where [p:ort = s:sname, p:plz > 40000, (p:plz mod 5) = 0];

optimize(select count(*) from staedte,Plan, Cost);

sql select count(*) 
    from staedte 
    where bev > 500000;
    
optimize(select count(*)
    from [staedte as s, plz as p]
    where [p:ort = s:sname, p:plz > 40000, (p:plz mod 5) = 0],Plan, Cost);
    
# sql select *
#    from [staedte as s, plz as p]
#    where [p:ort = s:sname, p:plz > 40000, (p:plz mod 5) = 0];

#teardown   
secondo('close database',R).