create table t1 (Zeit time, Tag tinyint not null, Monat tinyint not null,Jahr smallint not null, index(Tag), index(Monat), index(Jahr) );insert into t1 values ("09:26:00",16,9,1998),("09:26:00",16,9,1998);SELECT CONCAT(Jahr,'-',Monat,'-',Tag,' ',Zeit) AS Date,UNIX_TIMESTAMP(CONCAT(Jahr,'-',Monat,'-',Tag,' ',Zeit)) AS UnixFROM t1;