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", '{default: true}' as "ATTRIBUTES"

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