How To Create a Table Index in MySQL?
Submitted by: AdministratorIf you have a table with a lots of rows, and you know that one of the columns will be used often as a search criteria, you can add an index for that column to improve the search performance. To add an index, you can use the "CREATE INDEX" statement as shown in the following script:
mysql> CREATE TABLE tip (id INTEGER PRIMARY KEY,
subject VARCHAR(80) NOT NULL,
description VARCHAR(256) NOT NULL,
create_date DATE NULL);
Query OK, 0 rows affected (0.08 sec)
mysql> CREATE INDEX tip_subject ON tip(subject);
Query OK, 0 rows affected (0.19 sec)
Records: 0 Duplicates: 0 Warnings: 0
Submitted by: Administrator
mysql> CREATE TABLE tip (id INTEGER PRIMARY KEY,
subject VARCHAR(80) NOT NULL,
description VARCHAR(256) NOT NULL,
create_date DATE NULL);
Query OK, 0 rows affected (0.08 sec)
mysql> CREATE INDEX tip_subject ON tip(subject);
Query OK, 0 rows affected (0.19 sec)
Records: 0 Duplicates: 0 Warnings: 0
Submitted by: Administrator
Read Online MySQL Programming Job Interview Questions And Answers
Top MySQL Programming Questions
☺ | How To Use Regular Expression in Pattern Match Conditions? |
☺ | What Is TIMESTAMP in MySQL? |
☺ | How To Write Date and Time Literals? |
☺ | How To Use CASE Expression? |
☺ | How To Delete an Existing Column in a Table? |
Top Databases Programming Categories
☺ | RDBMS Interview Questions. |
☺ | SQL Interview Questions. |
☺ | SSRS Interview Questions. |
☺ | Database Administrator (DBA) Interview Questions. |
☺ | Sybase Interview Questions. |