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 3.3 Creating and Using a Database
 =================================

 
* Creating database           Creating and Selecting a Database
* Creating tables             Creating a Table
* Loading tables              Loading Data into a Table
* Retrieving data             Retrieving Information from a Table
 
 Once you know how to enter commands, it's time to access a database.
 
 Suppose that you have several pets in your home (your menagerie) and
 you'd like to keep track of various types of information about them.
 You can do so by creating tables to hold your data and loading them
 with the desired information.  Then you can answer different sorts of
 questions about your animals by retrieving data from the tables.  This
 section shows you how to:
 
    * Create a database
 
    * Create a table
 
    * Load data into the table
 
    * Retrieve data from the table in various ways
 
    * Use multiple tables
 
 The menagerie database will be simple (deliberately), but it is not
 difficult to think of real-world situations in which a similar type of
 database might be used.  For example, a database like this could be
 used by a farmer to keep track of livestock, or by a veterinarian to
 keep track of patient records.  A menagerie distribution containing
 some of the queries and sample data used in the following sections can
 be obtained from the MySQL Web site.  It's available in either
 compressed `tar' format
 (`http://www.mysql.com/Downloads/Contrib/Examples/menagerie.tar.gz') or
 Zip format
 (`http://www.mysql.com/Downloads/Contrib/Examples/menagerie.zip').
 
 Use the `SHOW' statement to find out what databases currently exist on
 the server:
 
      mysql> SHOW DATABASES;
      +----------+
      | Database |
      +----------+
      | mysql    |
      | test     |
      | tmp      |
      +----------+
 
 The list of databases is probably different on your machine, but the
 `mysql' and `test' databases are likely to be among them.  The `mysql'
 database is required because it describes user access privileges.  The
 `test' database is often provided as a workspace for users to try
 things out.
 
 Note that you may not see all databases if you don't have the `SHOW
 DATABASES' privilege.  `GRANT' GRANT.
 
 If the `test' database exists, try to access it:
 
      mysql> USE test
      Database changed
 
 Note that `USE', like `QUIT', does not require a semicolon.  (You can
 terminate such statements with a semicolon if you like; it does no
 harm.)  The `USE' statement is special in another way, too:  it must be
 given on a single line.
 
 You can use the `test' database (if you have access to it) for the
 examples that follow, but anything you create in that database can be
 removed by anyone else with access to it.  For this reason, you should
 probably ask your MySQL administrator for permission to use a database
 of your own.  Suppose that you want to call yours `menagerie'.  The
 administrator needs to execute a command like this:
 
      mysql> GRANT ALL ON menagerie.* TO 'your_mysql_name'@'your_client_host';
 
 where `your_mysql_name' is the MySQL username assigned to you and
 `your_client_host' is the host from which you connect to the server.

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