Interested to Buy Any Domain ? << Click Here >> for more details...
Give the reasoning behind using an index.
- 2 Answers
- 6212 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / pradeeshkumar
Its as simple as why do we need an index page in front of a
book. Whenever we wish to read a scpecific text from the
book, we'll first check the index and locate where that
specific text is. Similarly when create an index it enables
the queries to locate praticular row or entity in a table
by directly refering to the index instead of searching the
entire table. Whenever a table is created with a primary
key, an index ia automatically created on the primary key
column which makes easier access of table entries. When you
execute query say( select * from student where
student_id=10;), your query will first hit the index
(primary index on primary key column) and then will retrive
the corresponding row from the table. If there's no such
entry in the table, it'll return an empty result set
without searching the table.
| Is This Answer Correct ? | 0 Yes | 0 No |
Its as simple as why do we need an index page in front of a
book. Whenever we wish to read a scpecific text from the
book, we'll first check the index and locate where that
specific text is. Similarly when create an index it enables
the queries to locate praticular row or entity in a table
by directly refering to the index instead of searching the
entire table. Whenever a table is created with a primary
key, an index ia automatically created on the primary key
column which makes easier access of table entries. When you
execute query say( select * from student where
student_id=10;), your query will first hit the index
(primary index on primary key column) and then will retrive
the corresponding row from the table. If there's no such
entry in the table, it'll return an empty result set
without searching the table.
| Is This Answer Correct ? | 0 Yes | 0 No |
what are all the conversion and interfaces in GL,AP,AR,HRMS with example? otherwise send send link for these
0 Answers Pathway Technologies,
What do you mean by Oracle MEDIA RECOVERY?
What is mrc and what is its use? : oracle accounts receivable
I need a Technical evaluation between Oracle and SAP ? please do a need ful.
what is correlated subquery
What is the sql query to find the employee who has Nth maximum salary?
How can you gather statistics on a table?
please explain about oracle
how to replace not in with not exist?
1.In a table Gender is a column in that male and female are the two data.In a single statement i have to modify all male to female and all female to male vice versa. 2.In a single query i need the count of male data,count of female and total count
What is the meaning of "Modulus" and "Alignment" in a datafile. Data file might be from any database. Data file is created through unloading data from a table. So, while loading this data into my table, I need to use these keywords. Could any one can help me regarding this?
What Are Cross Validation & Adi?
Oracle General 
