SQL with Manoj

A running total is the summation of a sequence of numbers which is updated each time a new number is added to the sequence, simply by adding the value of the new number to the running total.

Let’s see how to get these Running totals by creating a simple SQL queries below:

USE [AdventureWorks]
GO

-- Method 1: (Query Cost 9%)
;with RunTot as (
select row_number() over(partition by s.SalesPersonID order by s.OrderDate) as row,
s.SalesPersonID, p.FirstName, p.LastName, s.TotalDue, s.OrderDate
from Sales.SalesOrderHeader s
join Person.Contact p
on s.SalesPersonID = p.ContactID)
select  a.row, a.SalesPersonID, a.FirstName, a.LastName, a.OrderDate, a.TotalDue, sum(b.TotalDue) as RunTotal
from RunTot a
join RunTot b on a.SalesPersonID = b.SalesPersonID and a.row >= b.row
group by a.row, a.SalesPersonID, a.FirstName, a.LastName, a.TotalDue, a.OrderDate
order by a.SalesPersonID, a.row

-- Method 2: (Query Cost 91%)
;with RunTot as (
select row_number() over(partition by s.SalesPersonID order by s.OrderDate) as row,
s.SalesPersonID, p.FirstName, p.LastName, s.TotalDue, s.OrderDate
from Sales.SalesOrderHeader s
join Person.Contact p
on s.SalesPersonID = p.ContactID)
select  row, SalesPersonID, FirstName, LastName, OrderDate, TotalDue,
(select SUM(TotalDue) from RunTot b where b.SalesPersonID=a.SalesPersonID and b.row<=a.row) as RunTotal
from RunTot a

-- Output Listed below: