Which is the fastest method to get the total row count for a MySQL Query?

MySQLMySQLi Database

You can use subquery with aggregate COUNT(*) to get the total row count. 

Let us first create a table −

mysql> create table DemoTable
(
   StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   StudentFirstName varchar(20),
   StudentAge int
);
Query OK, 0 rows affected (0.48 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(StudentFirstName,StudentAge) values('John',23);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable(StudentFirstName,StudentAge) values('Larry',21);
Query OK, 1 row affected (0.40 sec)
mysql> insert into DemoTable(StudentFirstName,StudentAge) values('Johnny',23);
Query OK, 1 row affected (0.43 sec)
mysql> insert into DemoTable(StudentFirstName,StudentAge) values('Chris',21);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable(StudentFirstName,StudentAge) values('David',23);
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable(StudentFirstName,StudentAge) values('James',21);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable(StudentFirstName,StudentAge) values('Jace',24);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable(StudentFirstName,StudentAge) values('Mike',21);
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable(StudentFirstName,StudentAge) values('Robert',25);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable(StudentFirstName,StudentAge) values('Mike',22);
Query OK, 1 row affected (0.23 sec)

Following is the query to display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-----------+------------------+------------+
| StudentId | StudentFirstName | StudentAge |
+-----------+------------------+------------+
| 1         | John             | 23         |
| 2         | Larry            | 21         |
| 3         | Johnny           | 23         |
| 4         | Chris            | 21         |
| 5         | David            | 23         |
| 6         | James            | 21         |
| 7         | Jace             | 24         |
| 8         | Mike             | 21         |
| 9         | Robert           | 25         |
| 10        | Mike             | 22         |
+-----------+------------------+------------+
10 rows in set (0.00 sec)

Following is the query to get total row count for a MySQL Query and set for all the column values −

mysql> select StudentFirstName,(select count(*) from DemoTable) AS Total_Count from DemoTable limit 10;

This will produce the following output −

+------------------+-------------+
| StudentFirstName | Total_Count |
+------------------+-------------+
| John             | 10          |
| Larry            | 10          |
| Johnny           | 10          |
| Chris            | 10          |
| David            | 10          |
| James            | 10          |
| Jace             | 10          |
| Mike             | 10          |
| Robert           | 10          |
| Mike             | 10          |
+------------------+-------------+
10 rows in set (0.03 sec)
raja
Published on 29-Apr-2019 10:47:05
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