eventprefmag Attributes

Attribute/Logical Rolename	Domain	Datatype	NULL	Definition
type		VARCHAR(6)	NO	Magnitude type. This character string is used to specify the type of the magnitude measure
evid		NUMERIC(15, 0)	NO	Event identifier. Each event is assigned a unique integer which identifies it in a database. It is possible for several records in the Origin relation to have the same evid. This indicates there are several opinions about the location of the event. The evid does not have to be identical to the local network’s event identifier, which is stored in the Origin table. This allows merging data for a single event from multiple sources without insisting that database evid is identical to the source’s local event identifier
magid		NUMERIC(15, 0)	NO	Magnitude identifier. This key is used to identify a magnitude in the Netmag relation. It is required for every magnitude
lddate		DATE	YES	Load date. Date and time that the record was created or last modified, in Oracle date datatype

eventprefmag Relationships

Parent Entity	Child Entity	Type	Foreign Keys
event	eventprefmag	Non-Identifying	evid
netmag	eventprefmag	Non-Identifying	magid

eventprefmag Check Constraints

Check Constraint Name	CheckConstraint
EventPrefMag_CHKTYP	type in ('a','b','e','l','l1','l2','lg','c','s','w','z','B', 'un','d','h','n')