CODEWITHSUNDEEP
mysql
Aayush
Aayush

Reputation: 1254

MySQL query to select results with auto increment as a new column added in the result

I have a student's table with the following fields:

student(student_id, student_name, student_avg)

I need to write a query in MySQL which will display the result as :

Serial no. => the result should also have a new column with serial number as 1,2,3,...,n like an auto increment for each row in the result. 

student_id
student_name
student_avg > 4

I don't want to alter my table in any way. All I have to do is write a query which will give me the above result. I hope I am clear.

Example data:

student_id         student_name      student_avg 
 1                    abc               2.5
 2                    xyz               4.1
 3                    def               4.2

Sample output after querying: 

serial_no    student_id    student_name     student_avg
  1             2            xyz               4.1
  2             3            def               4.2

Upvotes: 13

Views: 52811

Answers (2)

user1423506
user1423506

Reputation:

Try this on

SELECT  @s:=@s+1 serial_number,student_id,student_name,student_avg
FROM    students,
        (SELECT @s:= 0) AS s
WHERE
student_avg > 4;

https://stackoverflow.com/a/11096550/1423506

Upvotes: 44

Edward Ruchevits
Edward Ruchevits

Reputation: 6696

SET @serial=0;
SELECT @serial := @serial+1 AS `serial_number`, `column_name` FROM `table_name`;

In your particular case:

SET @serial=0;

SELECT 
   @serial := @serial+1 AS `serial_number`, 
   `student_id`, 
   `student_name`, 
   `student_avg`
FROM 
   `students`
WHERE
   `student_avg` > 4;

Upvotes: 11

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