Attribute data Flashcards
attribute table
contains information about features with 1 row for each feature linked to the spatial data by an FID
records
rows in a table
fields
columns in a table
standalone table
exists independently of a geographic dataset
flat file database
stores rows of information in a text or binary file, simple but inefficient management system
hierarchical database
has multiple files each containing multiple records and fields, related tables connected by a fixed key
relational database
multiple tables stored as files without predefined relationships, the user can temporarily join tables sharing a common field, preferred management system
key
used to join tables via a shared field, this can be undone at any time
join table
the source table, contains the information to be appended
target table
the destination table, receives the appended information, can join multiple join tables to a single target
cardinality
numeric relationships between objects in one table and their match in another, listed as target to join
rule of joining
there must be only one record in the join table for each record in the target table, joins are possible for one to one and many to one
relate
keeps tables separate but allows for analysis similar to a join, used for one to many cardinality
case field
specified field used to create groups to analyze smaller chunks of data
field definition
must be entered before any data can be entered into a field, cannot be changed