This is very simple to select a particular database from mysql> prompt. You can use SQL command use to select a particular database.
Example:
Here is an example to select database called TUTORIALS:
[root@host]# mysql -u root -p
Enter password:******
mysql> use TUTORIALS;
Database changed
mysql>
Now you have selected TUTORIALS database and all the subsequent operations will be performed on TUTORIALS database.
NOTE: all the database name, table names, table fields name are case sensitive. So you would have to use prpoer names while giving any SQL command.
Selecting MySQL Database Using PHP Script:
PHP provides function mysql_select_db to select a database.It returns TRUE on success or FALSE on failure.
Syntax:
bool mysql_select_db( db_name, connection );
Parameter Description
db_name Required - MySQL Database name to be selected
connection Optional - if not specified then last opened connection by mysql_connect will be used.