Question

I would like to have a rolling total in a field in my table. Example:

ID - Name - Total - RollingTotal
1 - James - 10 - 10
2 - John - 20 - 30
3 - Matthew - 10 - 40

Can anybody explain how to do this in SQL ? I literally have no idea how to go about this and it’s confusing me!

I have asked the wrong question. My table actually looks more like this

ID - Group - Name - Total - Rolling Total
1 - 1 - James - 10 - 10
2 - 1 - John- 10 - 20
3 - 2 - Matthew - 20 - 20
4 - 2 - Stephanie - 30 - 50

What is the stackOverflow etiquette here. The orginal question has been answered, but I didn’t explain myself well enough. Sorry all.

Answer 1

You could try:

SELECT t1.ID, t1.Name, t1.Total,
    (SELECT SUM(Total) FROM your_table t2
     WHERE t2.ID <= t1.ID) AS RollingTotal
FROM your_table t1
ORDER BY ID

EDITED after user new requirements:

SELECT t1.ID, t1.`group`, t1.Name, t1.Total,
    (SELECT SUM(Total) FROM your_table t2
     WHERE t2.ID <= t1.ID
       AND t2.`group` = t1.`group`) AS RollingTotal
FROM your_table t1
ORDER BY ID