By Richard Stones, Neil Matthew
This is not quite a nasty publication, yet given the readability with which PostgreSQL's professional (and loose) documentation is written, loads of it additionally is not worthwhile. convinced, it really is particularly thick, yet loads of these pages are devoted to quite gruesome screenshots and Windows-specific silliness i am keen to guess few participants of this product's audience are fairly attracted to. There also are whole chapters devoted to C# and Java APIs which may still most likely be separate books in the event that they rather desired to do justice to such topics--their inclusion right here simply appears like unnecessary filler.
If you might have completely no thought what SQL is and wish to get your toes rainy with Postgres, then this can be the absolute booklet for you. in case you have an outstanding inspiration what you are doing and simply are looking to choose up on a few of Postgres' quirks, i am not too definite you will be getting your money's worthy right here. It simply attempts to hide approach an excessive amount of floor too speedy, and the data finally ends up getting stretched a bit skinny.
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Extra info for Beginning Databases with PostgreSQL: From Novice to Professional, Second Edition (Beginning from Novice to Professional) (Volume 0)
In this book, we have used uppercase to aid readability. As you read through this book, we will be teaching you SQL, so by the time you get to the end, you will be comfortable with a wide range of SQL statements and how to use them. Database Management System Responsibilities As we stated earlier, a DBMS is a suite of programs that allow the construction of databases and applications that use them. The responsibilities of a DBMS include the following: • Creating the database: Some systems will manage one large file and create one or more databases inside it; others may use many operating system files or use a raw disk partition directly.
Of course, you are welcome to use a GUI rather than a commandline tool to construct your SQL commands; it’s your choice. Designing Tables So far, we have only two tables in our database, and we have not really talked about how we decide what goes in each table, except in the very informal way of doing what looked reasonable. This design, which includes tables, columns, and relationships, is more correctly called a schema. fm Page 33 Monday, January 24, 2005 4:18 PM CHAPTER 2 ■ RELATIONAL DATABASE PRINCIPLES Designing a database schema with more than a couple of dozen tables can be quite challenging if the data is complex.
Certainly, that is an important aspect of orders to most customers—they like to get what they ordered. If you’re thinking that it’s a similar problem to not knowing in advance how many orders a customer will place, you’re quite right. We have no idea how many items will be on each order. The repeating groups problem is never far away. We will leave this aside for now and deal with it in the “Creating a Simple Database Design” section later in this chapter. Figure 2-10 shows our order information table with some sample data, again shown in the graphical tool, pgAdmin III.