SELECT DISTINCT MONAT as "MONAT",MONAT as "TEXT",MONAT as "DESC", '' as "ATTRIBUTES" FROM CCCAL 

UNION select 0 as "MONAT",'schon immer' as "TEXT", 'frühestes Beginndatum' as "DESC", '' as "ATTRIBUTES"

UNION select 0 as "MONAT",'unbeschränkt' as "TEXT", 'spätestes Endedatum' as "DESC", '' as "ATTRIBUTES"