How to install MySQL
Follow these steps:
Installing MySQL on Windows
Your downloaded MySQL is neatly packaged with an installer. Download the installer package, unzip it anywhere and run setup.exe.
By default, this process will install everything under C:\mysql.
Verify MySQL installation
Once MySQL has been successfully installed, the base tables have been initialized, and the server has been started, you can verify its working via some simple tests.
Open your MySQL Command Line Client, it should be appeared with a mysql> prompt. If you have set any password, write your password here. Now, you are connected to the MySQL server and you can execute all the SQL command at mysql> prompt as follows:
For example: Check the already created databases with show databases command:
What is Primary key
A primary key is a single field or combination of fields that contains a unique record. It must be filled. None of the field of primary key can contain a null value. A table can have only one primary key.
In Oracle, total number of columns cannot be more than 32.