By Joe Celko
Half 1 covers the necessity, rules, and diversity of dimension criteria and half 2 offers examples of tangible criteria throughout many industries equivalent to language codes and call numbers. This publication is intensely informative and easy-to-read (I like Joe's writing style), and that i stumbled on myself guffawing out loud at numerous issues within the ebook such a lot particularly round beer and Mad Magazine's metric procedure. As an information analyst and modeler, considered one of my initiatives is to paintings with the enterprise to appreciate and record current domain names in addition to new and more advantageous enterprise/industry domain names. i'll use this e-book as a reference during this pastime.
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Extra resources for Joe Celko's data, measurements and standards in SQL
The most popular pairs, in order of increasing error detection ability, are (4, 5), (4, 7), (3, 7), (3, 5), (5, 6), and (3, 8). 2. Power-Sum Check Digits The weights can be defined as variable powers of a fixed base number and a modulus can then be applied to get the remainder. Prime numbers are the best modulus, but 10 is very common. The most common schemes use a base of 2 or 3 with a modulus of 7, 10, or 11. The combination of 2 and 11 with a separate symbol for a remainder of 10 is one of these types of check digit.
SELECT text_col, CASE WHEN ���������������������������������������������� text_col LIKE ‘%term%term%term%term%ter m%term%’ THEN �������� 6 WHEN �������������������������������������������� text_col LIKE ‘%term%term%term%term%t erm%’ THEN �������� 5 WHEN ������������������������������������������������ text_col LIKE ‘%term%term%term%term%’ THEN �������� 4 WHEN ������������������������������������������� text_col LIKE ‘%term%term%term%’ THEN �������� 3 WHEN �������������������������������������� text_col LIKE ‘%term%term%’ THEN �������� 2 WHEN ��������������������������������� text_col LIKE ‘%term%’ THEN �������� 1 ELSE �������������������������� 0 END AS term_tally FROM Foobar WHERE text_col LIKE ‘%term%’; This depends on the fact that a CASE expression executes the WHEN clauses in order of their appearance.
Sorting by components is hard unless you want them in the order given in the encoding; try to sort the tire sizes by construction, width, and diameter instead of by diameter, construction, and width. Another disadvantage is that a bad choice in one component can destroy the usefulness of the whole scheme. Another problem is extending the code. For example, if the standard tire number had to be expanded to include tread thickness in millimeters, where would that measurement go? Another number would have to be separated by a punctuation mark.
Joe Celko's data, measurements and standards in SQL by Joe Celko