Creating and Selecting a Database

Posted on February 4, 2012. Filed under: mysql |

If the administrator creates your database for you when setting up your permissions, you can begin using it. Otherwise, you need to create it yourself:
mysql> CREATE DATABASE menagerie;
Under Unix, database names are case sensitive (unlike SQL keywords), so you must always refer to your database asmenagerie, not as MenagerieMENAGERIE, or some other variant. This is also true for table names. (Under Windows, this restriction does not apply, although you must refer to databases and tables using the same lettercase throughout a given query. However, for a variety of reasons, the recommended best practice is always to use the same lettercase that was used when the database was created.)
If you get an error such as ERROR 1044 (42000): Access denied for user ‘monty’@’localhost’ to database ‘menagerie’ when attempting to create a database, this means that your user account does not have the necessary privileges to do so. Discuss this with the administrator or see Section 5.4, “The MySQL Access Privilege System”.
Creating a database does not select it for use; you must do that explicitly. To make menagerie the current database, use this command:
mysql> USE menagerie
Database changed
Your database needs to be created only once, but you must select it for use each time you begin amysql session. You can do this by issuing a USE statement as shown in the example. Alternatively, you can select the database on the command line when you invoke mysql. Just specify its name after any connection parameters that you might need to provide. For example:
shell> mysql -h host -u user -p menagerie
Enter password: ********
menagerie in the command just shown is not your password. If you want to supply your password on the command line after the -p option, you must do so with no intervening space (for example, as -pmypassword, not as -p mypassword). However, putting your password on the command line is not recommended, because doing so exposes it to snooping by other users logged in on your machine.
You can see at any time which database is currently selected using SELECTDATABASE().

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