By Chad Russell, Jon Stephens
Nearly each non-trivial software calls for info patience, and for an software of any major measurement and scope, endurance is sometimes accomplished utilizing a database. If youre construction or protecting any major software and are utilizing MySQL, this booklet is for you. For open resource and different forms of tasks, the MySQL database is a truly well known selection: its unfastened, quick, strong, and scalable, and it runs on all the significant systems, permitting greatest use of accessible assets. yet its effortless to ignore MySQLs pace and different merits in case your database layout is inefficient. Needlessly duplicating info, utilizing flawed varieties for columns, overloading a unmarried desk the place a number of tables could be used, failing to leverage the calculation good points of MySQL, and making a number of queries rather than an effective unmarried question are the various universal mistakes.
Beginning MySQL Database layout and Optimization indicates you ways to spot, conquer, and stay away from gross inefficiencies. It demonstrates find out how to maximize the numerous information manipulation gains that MySQL comprises. This booklet explains tips to comprise checks and branches on your queries, find out how to normalize your database, and the way to factor concurrent queries to spice up functionality, between many different layout and optimization subject matters. Youll additionally know about a few positive aspects new to MySQL 4.1 and 5.0 like subqueries, kept systems, and perspectives, all of so as to assist you construct much more effective applications.
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Extra resources for Beginning MySQL Database Design and Optimization: From Novice to Professional
The simplest of these is to select a single column from a given table: SELECT customer_id FROM customers WHERE firstname = 'John'; This query will return a list of the customer IDs for all records from the customers table in which the value stored for the customer's first name is John. To select more than one column, just add more column names, and separate them with commas: SELECT customer_id, lastname, subscribed_date FROM customers WHERE firstname = 'John'; Spaces following commas in SQL statements are optional, and we'll use them in this book as seems appropriate.
The ENUM and SET types require a comma-delimited list of possible values. Options for numeric types include UNSIGNED, meaning that the values must all be nonnegative, and ZEROFILL, meaning that MySQL will fill any unused digits to the left (or right, in the case of DECIMAL) with zeros. Columns may also be specified as being NULL or NOT NULL, which determines whether or not the column may contain nulls; the default is NULL. Text columns (of type CHAR, VARCHAR, TEXT, and so on) can take the BINARY option, which forces all comparisons made with values in that column to be case-sensitive.
44 CHAPTER 2 MySQL Column and Table Types To BEGIN WITH the obvious, the purpose of a database is to provide a place where you can store data now and retrieve it reliably at some time in the future. In this chapter, we'll look at and try to answer two key questions that follow from this premise: • What types of data can you store? • What kinds of structures can you use to store this data? Like any other modem relational database, MySQL offers a rich selection of datatypes for storing different kinds of data of various shapes and sizes.
Beginning MySQL Database Design and Optimization: From Novice to Professional by Chad Russell, Jon Stephens