- 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 can I enhance my select query to make it faster in MySQL?
For quicker querying, use MySQL IN() because it uses indexing internally. Let us first create a table −
mysql> create table DemoTable1618 -> ( -> ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> ClientName varchar(20), -> ClientEmailId varchar(30) -> ); Query OK, 0 rows affected (1.53 sec)
Insert some records in the table using insert command:
mysql> insert into DemoTable1618(ClientName,ClientEmailId) values('Chris Brown','Brown323@gmail.com'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1618(ClientName,ClientEmailId) values('David Miller','MillerDavid@gmail.com'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1618(ClientName,ClientEmailId) values('John Doe','998John_Doe@gmail.com'); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable1618(ClientName,ClientEmailId) values('John Smith','999John_Smith@gmail.com'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1618(ClientName,ClientEmailId) values('Adam Smith','Adam_Smith@gmail.com'); Query OK, 1 row affected (0.17 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable1618;
This will produce the following output −
+----------+--------------+-------------------------+ | ClientId | ClientName | ClientEmailId | +----------+--------------+-------------------------+ | 1 | Chris Brown | Brown323@gmail.com | | 2 | David Miller | MillerDavid@gmail.com | | 3 | John Doe | 998John_Doe@gmail.com | | 4 | John Smith | 999John_Smith@gmail.com | | 5 | Adam Smith | Adam_Smith@gmail.com | +----------+--------------+-------------------------+ 5 rows in set (0.00 sec)
Here is the query to use IN() for faster querying −
mysql> select * from DemoTable1618 where ClientEmailId IN('998John_Doe@gmail.com','999John_Smith@gmail.com','MillerDavid@gmail.com');
This will produce the following output −
+----------+--------------+-------------------------+ | ClientId | ClientName | ClientEmailId | +----------+--------------+-------------------------+ | 2 | David Miller | MillerDavid@gmail.com | | 3 | John Doe | 998John_Doe@gmail.com | | 4 | John Smith | 999John_Smith@gmail.com | +----------+--------------+-------------------------+ 3 rows in set (0.00 sec)
Advertisements