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By Neil Matthew Richard Stones
PostgreSQL is without doubt one of the world’s most well-liked Open resource relational database structures. it really is popular for its wide variety of features, and its skill to accomplish capabilities no longer on hand in different databases. The approaching free up of PostgreSQL 8.0 in overdue 2004/early 2005 will contain significant revisions, equivalent to Win32 local aid, and this ebook will give you the instruments for an individual making the transition or studying approximately PostgreSQL for the 1st time. This publication introduces readers to a number of the so much favorite positive factors, at the same time introducing key relational database layout and administration ideas that might aid the beginner reader successfully deal with their data-driven software. Over one hundred fifty pages of assurance is dedicated to the most well-liked PostgreSQL APIs, together with Hypertext Preprocessor, Perl, Java and C. clients of all degrees will get pleasure from the 50 pages of condensed reference fabric protecting PostgreSQL information kinds, syntax, the psql shopper, and big item help.
Read or Download Beginning Databases with PostgreSQL: From Novice to Professional, Second Edition (Beginning from Novice to Professional) PDF
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Additional resources for Beginning Databases with PostgreSQL: From Novice to Professional, Second Edition (Beginning from Novice to Professional)
Example text
As you can see, the data looks much as it did in a spreadsheet, laid out in rows and columns. In later chapters, we will explain the actual mechanics of defining a database table, storing, and accessing the data, but rest assured, it’s not difficult. Accessing Data in a Database You can easily view your PostgreSQL data using the psql tool from the command line, as you saw in Figure 2-4. However, PostgreSQL is not restricted to command-line use. org/, and also bundled with the Windows distributions of PostgreSQL from version 8.
When a user changes a column, you either see it before it changes or after it changes; you never see partial updates. A classic example is a bank database transferring money between two accounts. If, while the money was being transferred, someone were to run a report on the amount of money in all the accounts, it’s very important that the total be correct. It may not matter in the report which account the money was in at the instant the report was run, but it is important that the report doesn’t see the in-between point, where one account has been debited but the other not credited.
It’s easy to sort the data in different ways, and see the features and patterns in the data just by looking at it. Unfortunately, people often mistake a tool that is good for inspecting and manipulating data for a tool suitable for storing and sharing complex and perhaps business-critical data. The two needs are often very different. Most people will be familiar with one or more spreadsheets and quite at home with data being arranged in a set of rows and columns. org/) spreadsheet holding data about customers.