Neil Matthew Richard Stones's Beginning Databases with PostgreSQL: From Novice to PDF
By Neil Matthew Richard Stones
PostgreSQL is among the world’s preferred Open resource relational database platforms. it really is popular for its wide selection of services, and its skill to accomplish capabilities now not on hand in different databases. The coming near near free up of PostgreSQL 8.0 in overdue 2004/early 2005 will comprise significant revisions, comparable to Win32 local aid, and this booklet will give you the instruments for someone making the transition or studying approximately PostgreSQL for the 1st time. This e-book introduces readers to a few of the so much admired positive factors, concurrently introducing key relational database layout and administration rules that would support the amateur reader successfully deal with their data-driven software. Over one hundred fifty pages of assurance is dedicated to the preferred PostgreSQL APIs, together with Hypertext Preprocessor, Perl, Java and C. clients of all degrees will take pleasure in the 50 pages of condensed reference fabric masking PostgreSQL facts forms, syntax, the psql customer, and big item help.
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Extra info for Beginning Databases with PostgreSQL: From Novice to Professional, Second Edition (Beginning from Novice to Professional)
Maintaining referential integrity: Many database systems provide features that help to maintain referential integrity—the correctness of the data, as mentioned earlier. They will report an error when a query or update would break the relational model rules. What Is PostgreSQL? Now we are in a position to say what PostgreSQL actually is. It is a DBMS that incorporates the relational model for its databases and supports the SQL standard query language. PostgreSQL also happens to be very capable and very reliable, and it has good performance characteristics.
We will return to these ideas in Chapters 5 and 15. fm Page 15 Tuesday, February 1, 2005 7:25 AM CHAPTER 1 ■ INTRODUCTION TO POSTGRESQL Data Access with PostgreSQL With PostgreSQL, you can access your data in several ways: • Use a command-line application to execute SQL statements. We will do this throughout the book. • Embed SQL directly into your application (using embedded SQL). We will see how to do this for C applications in Chapter 14. • Use function calls (APIs) to prepare and execute SQL statements, scan result sets, and perform updates from a large variety of different programming languages.
This meant that we could never know how many columns were needed for orders. In a database, the number of columns in a table is effectively fixed by the design. So we must decide in advance how many columns we need, what type they are, and name each column before we can store any data. Never try to store repeating groups of data in a single row. The way around this restriction is to do exactly what we did with our orders and customers data: split the data into separate tables. Then you can join the tables together when you need data from both tables.
Beginning Databases with PostgreSQL: From Novice to Professional, Second Edition (Beginning from Novice to Professional) by Neil Matthew Richard Stones