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Lucas numbers have L 1 = 1, L 2 = 3, and L n = L n−1 + L n−2. Primefree sequences use the Fibonacci recursion with other starting points to generate sequences in which all numbers are composite. Letting a number be a linear function (other than the sum) of the 2 preceding numbers. The Pell numbers have P n = 2P n−1 + P n−2.
1: 1: A person must have their own birth certificate, it is specific to that person by its Id number. One-to-one (optional on one side) person ←→ driving license: 1: 0..1 or ? A person may have a driving license, it is specific to that person by its Id number. One-to-many: order ←→ line item: 1: 1..* or + An order contains at least one ...
Records life-cycle in records management refers to the following stages of a records "life span": from its creation to its preservation (in an archives) or disposal. While various models of the records life-cycle exist, they all feature creation or receipt, use, and disposition. [2]
The records continuum model. The records continuum model (RCM) is an abstract conceptual model that helps to understand and explore recordkeeping activities. It was created in the 1990s by Monash University academic Frank Upward with input from colleagues Sue McKemmish and Livia Iacovino as a response to evolving discussions about the challenges of managing digital records and archives in the ...
A relational-database implementation of a hierarchical model was first discussed in published form in 1992 [2] (see also nested set model). Hierarchical data organization schemes resurfaced with the advent of XML in the late 1990s [3] (see also XML database). The hierarchical structure is used primarily today for storing geographic information ...
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An IGES file is composed of 80-character ASCII records, a record length derived from the punched card era. Text strings are represented in "Hollerith" format, the number of characters in the string, followed by the letter "H", followed by the text string, e.g., "4HSLOT" (this is the text string format used in early versions of the Fortran language).
In this case, the star schema, although further denormalized, would only reduce the number or records by a (negligible) ~0.02% (=[1,000,000+300] instead of [1,000,000+300+220]) Some database developers compromise by creating an underlying snowflake schema with views built on top of it that perform many of the necessary joins to simulate a star ...