April 2007
Beginner
257 pages
7h 18m
English
book
Programming Interviews Exposed: Secrets to Landing Your Next Job, Second Edition
by John Mongan, Noah Suojanen, Eric Giguère
Content preview from Programming Interviews Exposed: Secrets to Landing Your Next Job, Second Edition
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10.3. Summary
Databases are used by many of today's applications, especially Web-based applications. Most database systems are based on the concepts of relational database theory, so you can expect any problems you encounter to be about accessing and manipulating relational data. To do this you'll need to understand basic SQL commands such as SELECT and INSERT.
Transactions are used to group multiple changes to a database together into a single unit such that either all the changes succeed and are made permanent (the transaction is committed) or all fail and are undone (the transaction is rolled back). The ACID acronym describes the four fundamental properties of a transaction: atomicity, consistency, isolation, and durability. Most relational databases support ACID transactions, although the isolation levels are often variable in order to allow for better performance.
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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