June 2010
Intermediate to advanced
328 pages
7h 51m
English
Content preview from SQL Antipatterns
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Antipattern: One Size Fits All
Books, articles, and programming frameworks have established a cultural convention that every database table must have a primary key column with the following characteristics:
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The primary key’s column name is id.
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Its data type is a 32-bit or 64-bit integer.
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Unique values are generated automatically.
The presence of a column named id in every table is so common that this has become synonymous with a primary key. Programmers learning SQL get the false idea that a primary key always means a column defined in this manner.
| ID-Required/anti/id-ubiquitous.sql | |
| | CREATE TABLE Bugs ( |
| | id SERIAL PRIMARY KEY, |
| | description VARCHAR(1000), |
| | -- . . . |
| | ); |
Adding an id column to every table causes several effects ...
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