By Chad Russell, Jon Stephens
Nearly each non-trivial program calls for information patience, and for an software of any major measurement and scope, patience is sometimes completed utilizing a database. If youre construction or retaining any major program and are utilizing MySQL, this ebook is for you. For open resource and different kinds of initiatives, the MySQL database is a really well known selection: its loose, speedy, powerful, and scalable, and it runs on the entire significant systems, permitting greatest use of obtainable assets. yet its effortless to ignore MySQLs velocity and different benefits in case your database layout is inefficient. Needlessly duplicating info, utilizing flawed kinds for columns, overloading a unmarried desk the place a number of tables could be used, failing to leverage the calculation positive aspects of MySQL, and making a number of queries rather than a good unmarried question are a few of the universal mistakes.
Beginning MySQL Database layout and Optimization exhibits you ways to spot, conquer, and steer clear of gross inefficiencies. It demonstrates tips to maximize the various information manipulation good points that MySQL comprises. This booklet explains the way to contain assessments and branches on your queries, easy methods 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 beneficial properties 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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Extra info for Beginning MySQL Database Design and Optimization: From Novice to Professional
77', '2003-10-12', ''); Since customer_id is an auto-incrementing column, MySQL will automatically insert the next available integer for that column. Note that we can use NULL for this purpose with an auto-incrementing column, even though its definition contains a NOT NULL specifier. The listed default values will be inserted for the other two columns: an integer zero for the zipcode column, and 0000-00-00 for ship_date. ) Any of these three formats is equally acceptable. One might be more appropriate or easier to use than the others in different circumstances; otherwise, it's a matter of personal preference.
All rows meeting the condition will be deleted from the table, and it's up to you to make sure that only one record matches that condition if you wish to delete a single row. 39 Chapter 1 NOTE Using id as the name or part of the name ofa column in and of itself does not give the column any special properties; this is a somewhat common misapprehension. Uniqueness must be guaranteed by making the column a unique or primary key and (optionally) using the AUTO_INCREMENT attribute for the column definition.
There also are some additional clauses and operators not shown here that you may use with SELECT queries. We'll introduce and discuss these in more detail later in this section. 19 Chapter 1 Examples Let's look at a few basic examples of SELECT queries in use. 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.