Station_Digitizer Columns

ColumnName	Domain	Datatype	NULL	Definition
sta		VARCHAR2(6)	NO	Station code. This is the common code-name of a seismic observatory. Generally only three or four characters are used
net		VARCHAR2(8)	NO	Unique network identifier. This character string is the name of a seismic network
digi_nb		NUMBER(8, 0)	NO	This attribute represents the digitizer number
ondate		DATE	NO	This attribute denotes the start date
serial_nb		VARCHAR2(80)	NO	This attribute denotes a serial number of a datalogger board
nb_pri_pchannel		NUMBER(8, 0)	NO	This attribute denotes the number of primary physical channels of a digitizer
nb_aux_pchannel		NUMBER(8, 0)	NO	This attribute denotes the number of auxiliary physical channels of a digitizer
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_Digitizer Primary and Unique Keys

Key Name	Key Type	Keys
StDi00	PrimaryKey	sta, net, digi_nb, ondate

Station_Digitizer Foreign Keys

Parent Relationships:

Table Name	Type	Cardinality	Constraint Name	VerbPhrase	InversePhrase	Foreign Keys	Is Supertype	Deferrable	Initially Deferred
Station	Identifying	One To Zero or More	Sta_Dig_Sta			sta, net, ondate	NO	NO	NO

Child Relationships:

Table Name	Type	Cardinality	Constraint Name	VerbPhrase	InversePhrase	Foreign Keys	Is Subtype	Deferrable	Initially Deferred
Station_Digitizer_PChannel	Identifying	One To Zero or More	Sta_Dig_PCh_Sta_Dig				NO	NO	NO

Station_Digitizer Check Constraints

Check Constraint Name	CheckConstraint
StDi01	digi_nb >= 1
StDi02	nb_aux_pchannel >= 0
StDi03	nb_pri_pchannel >= 0