Station_Filamp Attributes

Attribute/Logical Rolename	Domain	Datatype	NULL	Definition
sta		VARCHAR(6)	NO	Station code. This is the common code-name of a seismic observatory. Generally only three or four characters are used
net		VARCHAR(8)	NO	Unique network identifier. This character string is the name of a seismic network
filamp_nb		NUMERIC(8, 0)	NO	This attribute represents the filter-amplifier number
ondate		DATE	NO	This attribute denotes the start date
filamp_id		NUMERIC(8, 0)	NO	Filter-amplifier identifier. Each filter-amplifier is assigned a unique integer which identifies it in a database
nb_pchannel		NUMERIC(8, 0)	NO	This attribute denotes the number of physical channels of a datalogger
offdate		DATE	YES	This attribute denotes the end date
lddate		DATE	YES	Load date. Date and time that the record was created or last modified, in Oracle date datatype

Station_Filamp Keys

Key Name	Key Type	Keys
StFi00	PrimaryKey	sta, net, filamp_nb, ondate

Station_Filamp Relationships

Parent Relationships:

Entity Name	Type	Cardinality	Business Name	VerbPhrase	InversePhrase	Foreign Keys	Is Supertype
Filamp	Non-Identifying	One To Zero or More				filamp_id	NO
Station	Identifying	One To Zero or More				sta, net, ondate	NO

Child Relationships:

Entity Name	Type	Cardinality	Business Name	VerbPhrase	InversePhrase	Foreign Keys	Is Subtype
Station_Filamp_PChannel	Identifying	One To Zero or More					NO

Station_Filamp Check Constraints

Check Constraint Name	CheckConstraint
StFi01	filamp_nb >= 1
StFi02	nb_pchannel >= 0