Skip to main content

Managing Databases


1. Login in to the mysql client using the login name and password provided by your instructor.

2. View the existing databases that the MySQL Server is maintaining.

mysql> SHOW DATABASES;

3. There should be only three databases that the MySQL Server is maintaining:
INFORMATION_SCHEMA, mysql and test. Remove any additional databases that exist.

If need be, mysql> DROP DATABASE db_name;

4. Create a new database called photo_album with a default character set of utf8.

mysql> CREATE DATABASE photo_album CHARACTER SET utf8;

5. Using the mysql client, verify that the database was created.

mysql> SHOW DATABASES;

6. View the contents of the /usr/local/mysql/data directory. Is there a new sub-directory associated with
the database just created?

>ls /usr/local/mysql/data/

7. View the db.opt file located in the associated sub-directory to verify the correct default character set
is being used. What collation type has been assigned as default? Does that make sense for the
character set chosen?

> more /usr/local/mysql/data/photo_album/db.opt
Labels:

Comments

Post a Comment

Popular posts from this blog

PHP INTRODUCTION

                     PHP  (recursive acronym for  PHP: Hypertext Preprocessor ) is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML. PHP stands for  P HP:  H ypertext  P reprocessor PHP is a server-side scripting language, like ASP PHP scripts are executed on the server PHP supports many databases (MySQL, Informix, Oracle, Sybase, Solid, PostgreSQL, Generic ODBC, etc.) PHP is an open source software PHP is free to download and use Why PHP? PHP runs on different platforms (Windows, Linux, Unix, etc.) PHP is compatible with almost all servers used today (Apache, IIS, etc.) PHP is FREE to download from the official PHP resource:  www.php.net PHP is easy to learn and runs efficiently on the server side What can PHP do? Anything. PHP is mainly focused on server-side scripting, so you can...
6 comments
Read more

Self Joins

A table name is always ambiguous when table is joined to itself using a self-join. For example, the Country table in the world database contains an IndepYear column indicating the year in which each country achieved independence. To find all countries that have the same year of independence as some given country, a self-join can be used. However, the query cannot be written like this: mysql> SELECT IndepYear, Name, Name -> FROM Country JOIN Country -> ON IndepYear = IndepYear AND Name = 'Qatar'; ERROR 1066 (42000): Not unique table/alias: 'Country' Furthermore, the ambiguity cannot be removed from column references by preceding them with table name qualifiers because the names remain identical: mysql> SELECT Country.IndepYear, Country.Name, Country.Name -> FROM Country JOIN Country -> ON Country.IndepYear = Country.IndepYear -> AND Country.Name = 'Qatar'; ERROR 1066 (42000): Not unique table/alias: 'Country' It ...
Post a Comment
Read more