ja - normalisera lite:
EVENT
------
event_id
start_tm
end_tm
description
EVENT_SERVICE
-------------
event_id
service_id
employee_id
start_tm
end_tm
(other info as needed)
SERVICE
---------
service_id
description
CAUSE
-------
cause_id
description
EVENT_CAUSE
-----------
event_id
cause_id
redigerad för att återspegla ypercubes-kommentaren med en separat SERVICE-tabell