Adventure Works SQL Server 2014 Enquiry

Question

I am writing a SQL query using the AdventureWorks 2014 database. I want to show which employee has sold for the highest order value.

I tried to write each select statement by itself (see below), but I'd like to be able to combine both queries into one:

select 
    s.SalesOrderID, s.SalesPersonID, COUNT(sd.SalesOrderID) as count 
from 
    Sales.SalesOrderHeader s, Sales.SalesOrderDetail sd
where 
    s.SalesOrderID = sd.SalesOrderID 
group by           
    sd.SalesOrderID, s.SalesOrderID, s.SalesPersonID 
order by 
    sd.SalesOrderID

select 
    sd.SalesOrderID, sd.LineTotal, count (sd.SalesOrderID) as count 
from 
    Sales.SalesOrderDetail sd
group by 
    sd.SalesOrderID, sd.LineTotal 
order by 
    sd.SalesOrderID

Answer 1

are you looking for something like this:

select top 1  
    s.SalesPersonID
    ,sum(sd.LineTotal ) as orderTotal
    s.salesorderid
from
    Sales.SalesOrderHeader s
    inner join  Sales.SalesOrderDetail sd
        on s.SalesOrderID = sd.SalesOrerID
group by 
    s.SalesPersonID
    s.salesorderid
order by
    orderTotal desc

in SQL server you can just ask for a limited number of rows with the top function (this can give you the highest order value when sorted correctly). this can be used with a group by that adds all the line totals together that have the same values in the columns being grouped by.

Answer 2

This is what I would do, to get the total by each Sales Person. Order by the Sum(sd.LineTotal) descending to get the Highest Value.

select s.SalesPersonID ,COUNT(sd.SalesOrderID) as count,sum(sd.LineTotal ) as orderTotal  
from Sales.SalesOrderHeader s 
Inner Join Sales.SalesOrderDetail sd ON s.SalesOrderID=sd.SalesOrderID 
group by s.SalesPersonID 
order by 3 Desc

Answer 3

We appreciate your effort. However, there is a simpler way to get your answer.

SELECT 
-- TOP 1   //to get highest order total
 s.SalesPersonID
 ,COUNT(sd.SalesOrderID) as Total_Count
 ,sum(sd.LineTotal) as orderTotal  
FROM 
  Sales.SalesOrderHeader s Inner Join Sales.SalesOrderDetail sd 
  ON s.SalesOrderID=sd.SalesOrderID 
GROUP BY s.SalesPersonID 
HAVING s.SalesPersonID IS NOT NULL
ORDER BY sum(sd.LineTotal) desc

What I am doing is, joining SalesOrderHeader with SalesOrderDetail through SalesOrderId and using aggregate functions to get desired result.

Order by is use to get highest value first. Top 1 is use to get only desired output.