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QuoteRef: bosaR4_1962
topics >
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Topic:
database queries, joins, and relational algebra
Topic:
objects as a set of attributes
Topic:
information as facts
Group:
information
Topic:
undefined, null, and other signal values
Topic:
ordered data types
Reference
Bosak, R., Clippinger, R.F., Dobbs, C., Goldfinger, R., Jasper, R.B., Keating, W., Kendrick, G., Sammet, J.E., "An information algebra. Phase 1 report--Language Structure Group of the CODASYL Development Committee", Communications of the ACM, 5, 4, April 1962, pp. 190-204. Google
191 ;;Quote: information algebra deals with sets of points in a space; each entity has exactly one datum point in a given property space; e.g., (employee number, hourly payrate)
191 ;;Quote: every property value set includes two values: undefined (alpha) and missing (omega); distinguished from zero
196 ;;Quote: a glumping function groups by equality; e.g., orders for a part in a back order file (PartNum, QuantityOrdered, Date)
197 ;;Quote: relations, joins, and group-by deliberately ignore the notion of order; called "area", "bundling", and "glumping"
Topic: database queries, joins, and relational algebra (34 items)
Topic: objects as a set of attributes (39 items)
Topic: information as facts (21 items)
Group: information (46 topics, 1160 quotes)
Topic: undefined, null, and other signal values (34 items)
Topic: ordered data types (8 items)