Once your database and script installation is over then let us learn how to manage it.
SQL ( Structured Query Language ) is one of the important tool for the programmers. Sql is a part of the database management tool. There are many databases available from different venders. For web applications MSSQL, MySQL, MS Access are mostly used. Oracle is very popular among enterprise users. MySQL can be downloaded from mysql.net and it is free. Combination of PHP and MySQL is the most popular in the world today among all the web applications.
What is SQL
Sql is a common language to manage all the operations for a database. There are different SQL commands available to manage the database. You need not start reading or take training on all the commands at a time, you can use this site as a referance and read all our
free tutorials on SQL.
Now let us start with simple query to create table to store our student records. Then we will use insert query to add few records. Don't worry to understand all the meanings of the Query at this stage. Use this SQL to create the table.
CREATE TABLE student ( id int(2) NOT NULL auto_increment, name varchar(50) NOT NULL default '',
This will create the table for us. We can see that there are three fields in the
table. One is id which is an auto increment and will take one unique number each
time one record is added to the table. Next field is name of 50 length, this
will store the student name. Next is class field of 10 length.
class varchar(10) NOT NULL default '', mark int(3) NOT NULL default '0',
UNIQUE KEY id (id) ) TYPE=MyISAM;
Let us fill the tables with some data. Here is the SQL to insert the data to the table. We
need not worry at this stage how this SQL works as we will discuss that in other
pages. You can just copy and paste this SQL code in your SQL window to
insert some records to the tables.
INSERT INTO student VALUES (1, 'John Deo', 'Four', 75);
This SQL code will insert six records to the student table. Now our table with data is ready. We will start learning
one SQL command now .
INSERT INTO student VALUES (2, 'Max Ruin', 'Three', 85);
INSERT INTO student VALUES (3, 'Arnold', 'Three', 55);
INSERT INTO student VALUES (4, 'Krish Star', 'Four', 60);
INSERT INTO student VALUES (5, 'John Mike', 'Four', 60);
INSERT INTO student VALUES (6, 'Alex John', 'Five', 55);
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|Need a step by step guide to the selection query and the rest of the most common queries and how to build put them all together|
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