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

UNION select 1800 as "JAHR",'schon immer' as "TEXT",'frühestes Beginndatum' as "DESC", '' as "ATTRIBUTES"

UNION select 2999 as "JAHR",'unbeschränkt' as "TEXT",'spätestes Endedatum' as "DESC", '' as "ATTRIBUTES"