By Chad Russell, Jon Stephens

Nearly each non-trivial program calls for information endurance, and for an software of any major measurement and scope, endurance is sometimes completed utilizing a database. If you’re development or retaining any major software and are utilizing MySQL, this publication is for you. For open resource and different kinds of tasks, the MySQL database is a really well known selection: it’s unfastened, quick, strong, and scalable, and it runs on the entire significant systems, permitting greatest use of obtainable assets. yet it’s effortless to ignore MySQL’s velocity and different benefits in the event that your database layout is inefficient. Needlessly duplicating facts, utilizing unsuitable kinds for columns, overloading a unmarried desk the place a number of tables might be used, failing to leverage the calculation beneficial properties of MySQL, and making a number of queries rather than a good unmarried question are many of the universal mistakes.

Beginning MySQL Database layout and Optimization exhibits you the way to spot, triumph over, and stay away from gross inefficiencies. It demonstrates how you can maximize the various facts manipulation positive aspects that MySQL contains. This booklet explains find out how to contain exams 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 themes. You’ll additionally know about a few good points new to MySQL 4.1 and 5.0 like subqueries, kept techniques, and perspectives, all of for you to assist you construct much more effective applications.

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Example text

This is due in no small part to the fact that it simply makes sense to refer to the column that uniquely identifies each row of a table as an ID or id. Whether or not you choose to prefix all columns in a table with the name of the table (and there are good arguments for and against that practice), it's always a good idea to prefix the name of the column that serves as the table's primary key. For example, let's say you're developing an online shopping cart system, and your database needs a products table to hold information about the items being offered sale.

23, this statement updates the column or columns in the table table_name with the value or values indicated by the equal signs. You can use a WHERE clause to determine the conditions under which those columns will be updated in any given record. ) 36 Review ofMySQL Basics Examples Let's take a look at a few examples of using the UPDATE command; we'll continue to use our orders table. To start with, the simplest case might be something like this: UPDATE orders SET ship_date = NOW(); This will set the ship_date column in every record of the table to today's date.

To set the ship_date for only those records in which this column hasn't yet been set, we would use this form: UPDATE records SET ship_date = NOW() WHERE ship_date = 'oooo-oo-oo'; An expression used in the SET clause to change the value of a particular column may be self-referential. 1; As a slightly different scenario, let's say that another department had already adopted this practice, but nobody bothered to send us a copy of the memo until ten weeks after the fact. 1 WHERE order_date < '2003-09-14'; Of course, we can also update multiple columns in a single query.

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