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)
Published on 08-Nov-2019 11:08:21
