select position('test' in rule_name) from logs limit 5; vysledek 0 5 5 4 1 (5 rows) select sum(position('test' in rule_name)) from logs limit 5; ma byt vysledkem 5+5+4+1 tj. 15 nebo ma byt stejny jako v prikazu: select sum(position('test' in rule_name)) from logs;