Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to add a unique index on the above table TAB1 for column Enrollment ID (ascending)?
An index is a lookup table that optimizes the searching of data. An index defined on any table can increase the query speed. The index can be built up on any column of the table and DB2 will generate a logical structure at backend. This will facilitate the search on the table using indexed columns effectively.
An index can be unique and non-unique. To create a new unique index at any table we can use below command.
CREATE UNIQUE INDEX ENROTAB1 ON TAB1 (ENROLLMENT_ID) ASC;
The CREATE UNIQUE INDEX reserved words are followed by the name of the unique index which we want to create.
The ON parameter is followed by the name of the table on which index has to be built and this is followed by the name of the column in that table.
We have an option to organize the data within the index in ascending or descending order. Accordingly, we can use parameter ACS for ascending and DESC for descending.
119 Views
To Continue Learning Please Login