SQL Indexes

SQL uses index to find records quickly when a query is processed. Using Index can drastically enhance the performance of an application.

Understand with Examples

The Tutorial illustrate an example from SQL Indexes. To understand and grasp the example we create a table 'stu' that has the required fieldnames and datatypes respectively.

Create Table Stu:

Create table stu(id int, name varchar(10));

Create Index:

The Create Index is used to create index_on_id on table 'stu'.

mysql> CREATE INDEX index_on_id ON stu (id);
Query OK, 3 rows affected (0.06 sec)
Records: 3  Duplicates: 0  Warnings: 0

Insert values into stu:

The insert into keyword is used to add thee records to the table 'stu'.

insert into stu values (1,'komal');
insert into stu values (2,'ajay');
insert into stu values (3,'santosh');

Stu Table:

mysql> select * from stu;
+------+---------+
| id   | name    |
+------+---------+
| 1    | komal   |
| 2    | ajay    |
| 3    | santosh |
+------+---------+
3 rows in set (0.00 sec)

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