Generate the row count (serial number) of records after returning the result in MySQL query?

To generate serial number i.e. row count in MySQL query, use the following syntax.

SELECT @yourVariableName − = @yourVariableName+1 anyAliasName,
   yourColumnName1,yourColumnName2,yourColumnName3,....N from yourTableName ,
   (select @yourVariableName − = 0) as yourVariableName;

To understand the above syntax, let us create a table. The query to create a table is as follows −

mysql> create table tblStudentInformation
   -> (
   -> StudentName varchar(20),
   -> StudentAge int,
   -> StudentMathMarks int
   -> );
Query OK, 0 rows affected (0.68 sec)

Insert some records in the table using insert command. The query is as follows −

mysql> insert into tblStudentInformation values('Carol',23,89);
Query OK, 1 row affected (0.18 sec)

mysql> insert into tblStudentInformation values('Bob',25,92);
Query OK, 1 row affected (0.22 sec)

mysql> insert into tblStudentInformation values('John',21,82);
Query OK, 1 row affected (0.15 sec)

mysql> insert into tblStudentInformation values('David',26,98);
Query OK, 1 row affected (0.21 sec)

Display all records from the table using select statement. The query is as follows −

mysql> select *from tblStudentInformation;

The following is the output.

+-------------+------------+------------------+
| StudentName | StudentAge | StudentMathMarks |
+-------------+------------+------------------+
| Carol       | 23         |               89 |
| Bob         | 25         |               92 |
| John        | 21         |               82 |
| David       | 26         |               98 |
+-------------+------------+------------------+
4 rows in set (0.00 sec)

The following is the query to generate the serial number in MySQL query −

mysql> SELECT @serialNumber − = @serialNumber+1 yourSerialNumber,
   -> StudentName,StudentAge,StudentMathMarks from tblStudentInformation,
   -> (select @serialNumber − = 0) as serialNumber;

Here is the output displaying the row number in the form of serial number.

+------------------+-------------+------------+------------------+
| yourSerialNumber | StudentName | StudentAge | StudentMathMarks |
+------------------+-------------+------------+------------------+
|                1 | Carol       |         23 |               89 |
|                2 | Bob         |         25 |               92 |
|                3 | John        |         21 |               82 |
|                4 | David       |         26 |               98 |
+------------------+-------------+------------+------------------+
4 rows in set (0.00 sec)