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QuoteRef: dateCJ_1998
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ThesaHelp:
references c-d
Topic:
data type as a set of values
Topic:
data type by name or tags
Topic:
restricted and extended types
Topic:
data record
Topic:
attribute-value pairs as information
Topic:
tuples
Topic:
database queries, joins, and relational algebra
Topic:
uniform data model
Topic:
undefined, null, and other signal values
Topic:
database schema
Topic:
value as an abstraction
Topic:
pointers to data
Topic:
value as an object
Topic:
safe use of pointers
Topic:
object-oriented databases
Reference
Date, C.J., Darwen, H., Foundation of Object/Relational Databases: The third manifesto, Reading, MA, USA, Addison-Wesley, 1998. Google
33 ;;Quote: a domain or scalar data type is a named set of scalar values; name equivalence
36 ;;Quote: a tuple value is an array of typed, attribute-value triples; its typed attributes is the heading; its length is the degree
173 ;;Quote: a database relation is a set of tuples, without duplicates
173 ;;Quote: nulls are not values; a database relation does not contain nulls nor need many-valued logic
187 ;;Quote: no value shall possess an ID that is distinct from the value per se
187+;;Quote: object IDs produce a pointer free-for-all as found in prerelational databases
187+;;Quote: object IDs are logically nothing but pointers to objects
449 ;;Quote: if nulls aren't values, then relations with null values aren't relations and the relational model is lost
449 ;;Quote: represent missing values, as appropriate, by the empty set, empty string, "UNKNOWN", etc.
449 ;;Quote: if an attribute value is not known than the tuple can not be constructed or inserted into a relvar
450 ;;Quote: no method exists for treating null marks orthogonally w.r.t. data types
ThesaHelp: references c-d (337 items)
Topic: data type as a set of values (20 items)
Topic: data type by name or tags (29 items)
Topic: restricted and extended types (34 items)
Topic: data record (57 items)
Topic: attribute-value pairs as information (53 items)
Topic: tuples (17 items)
Topic: database queries, joins, and relational algebra (33 items)
Topic: uniform data model (19 items)
Topic: undefined, null, and other signal values (33 items)
Topic: database schema (29 items)
Topic: value as an abstraction (25 items)
Topic: pointers to data (55 items)
Topic: value as an object (29 items)
Topic: safe use of pointers (102 items)
Topic: object-oriented databases (15 items)