How to create index in sql | Understanding about index in SQL | SQL Index | Use of index in sql

Опубликовано: 15 Октябрь 2024
на канале: rejawebs

In this course we will try to know about the Index in SQL
SQL INDEX Statement:
Indexes are used to retrieve data from the database more quickly than otherwise.
The users cannot see the indexes, they are just used to speed up searches/queries.
When should indexes be avoided?
Although indexes are intended to enhance a database's performance, there are times when they should be avoided.

The following guidelines indicate when the use of an index should be reconsidered.
Indexes should not be used on small tables.
Tables that have frequent, large batch updates or insert operations.
Indexes should not be used on columns that contain a high number of NULL values.
Columns that are frequently manipulated should not be indexed.
SQL Syntax:
Create Index:
CREATE INDEX Index_Name
ON Table_Name (column1, column2, ...);
Drop Index:
DROP INDEX Index_Name;
Let's take a look in query window...
TO be used index...
SELECT * FROM dbo.PersonInfo
WHERE FirstName='devid'
so let's go to the query window to see the simple example of index.
CREATE INDEX indx_personinfo
ON dbo.PersonInfo (FirstName);

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