SQL: 1999 - Understanding Relational Language Components - download pdf or read online

By Jim Melton

ISBN-10:

ISBN-13: 0605040302543

ISBN-10: 1558604561

ISBN-13: 9781558604568

It's a excellent assurance of SQL typical, yet i did not just like the sort of writing. similar to many SQL books you need to spend it slow taking a look at the pattern database as a way to comprehend the concept.This to me is a waste of time and annoying.The distinction is obvious if you happen to examine it to different books like Date's "Introduction to Database Systems".

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Additional info for SQL: 1999 - Understanding Relational Language Components (The Morgan Kaufmann Series in Data Management Systems)

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Instruct the DBMS to make all actions final. Presumably, at the end of the day or at various points during the day, all the shipping order records will be printed (and deleted) to trigger the loading of trucks; all the billing records will be printed (and deleted) to be sent to the stores; and so forth. If at any point a n y t h i n g goes wrong, the entire transaction is rolled back, or aborted. This means that all actions performed on behalf of the transaction are u n d o n e in the database; specifically, the quantity isn't subtracted from the inventory, the shipping order record isn't preserved, the billing record isn't preserved, accounts receivable are not updated, and the reorder record isn't preserved.

You already k n o w w h a t a data type is: It's the characteristic of a piece of data t h a t says it is a character string, an integer, a floating-point n u m b e r , or whatever. Data is stored in a table in tuples (rows in SQL). As a result, a table looks a bit like a matrix, w i t h the c o l u m n s identifying the individual data e l e m e n t s (by n a m e , usually, as well as by data type) a n d the rows representing records of related data. ) acting like rows. Or, getting back to our example, a table m i g h t look like a CD distributor's account sheet, as in Table 1-1.

This, more than anything else, is the reason SQL was selected for standardization and that database product vendors still devote such high levels of energy to the standardization effort. One final observation about data sublanguages that should be made in this section is in regard to XML, the Extensible Markup Language. An XML standard was published in 1998 by the World Wide Web Consortium (W3C), with the objective of providing a mechanism through which Internet "content providers" could add tags to text to indicate the intrinsic meaning of that textmsort of a colocated metadata scheme that might look like the following example: 18 Chapter 1 Database and Technology Foundations Charcoal Gray $30,000 Daimler Chrysler 5 The idea is that you could use an Internet search engine to ask for all Web pages based on specified criteriaufor example, all Daimler Chrysler m i n i v a n s u and receive information from auto buying services, evaluation services, and the like.

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SQL: 1999 - Understanding Relational Language Components (The Morgan Kaufmann Series in Data Management Systems) by Jim Melton


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