Storage Retrieval

Download Data and Databases. Concepts in Practice by Zerubavel PDF

By Zerubavel

"Days, months, and years got to us via nature, yet we invented the week for ourselves. there's not anything inevitable a few seven-day cycle, or approximately the other type of week; it represents an arbitrary rhythm imposed on our actions, unrelated to something within the usual order. yet the place the week exists—and there were many cultures the place it doesn't—it is so deeply embedded in our event that we rarely query its rightness, or reflect on it as a man-made conference; for many folks it's a subject of 'second nature.'

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One row in the VIEW maps to exactly one row in the base table from which it is drawn. However, other views are updatable, and some vendors support more than the basic version given in the SQL-92 standard. The VIEW must have an INSERT, UPDATE, and DELETE rule under the covers that maps its rows back to a single row in the base table(s). Nathan Goodman (1990) discusses the conditions required for updating the following types of VIEWs: 1. Projection from a single table 2. Selection/projection from a single table 3.

This approach recognizes that there are occurrences of values, but it puts them into a single collection. That is, where SQL sees three separate but equivalent cans of cat food, Date’s model sees a single class of canned cat food, and Codd’s model sees a collection of three cans of cat food. 4 Uniqueness There is a rule of thumb in SQL database design that says that all base tables should have a primary key. This will avoid a lot of the problems involved with duplicates and will make your SQL database look more like a pure relational database.

One-to-one outer joins 7. One-to-many outer joins 8. Many-to-many joins 9. Translated and coded fields Another feature, which is not used enough, is the WITH CHECK OPTION clause on a VIEW. This can be a bit tricky (I have a section in SQL for Smarties that discusses this feature in detail). In 25 words or less, WITH CHECK OPTION requires the VIEW to reevaluate the WHERE clause in the defining query every time a row is changed. For example, let’s build a VIEW of the salesmen in an imaginary company.

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