SQL SERVER T-SQL Calculate SubTotal and Total by group - sql

Question

I am trying to add subtotal by group and total to a table. I've recreated the data using the following sample.
DECLARE #Sales TABLE(
CustomerName VARCHAR(20),
LegalID VARCHAR(20),
Employee VARCHAR(20),
DocDate DATE,
DocTotal Int,
DueTotal Int
)
INSERT INTO #Sales SELECT 'Jhon Titor','12345', 'Employee1','2015-09-01',1000,200
INSERT INTO #Sales SELECT 'Jhon Titor','12345', 'Employee1','2015-08-20',500,100
INSERT INTO #Sales SELECT 'Jhon Titor','12345', 'Employee1','2015-08-18',200,50
INSERT INTO #Sales SELECT 'Deli Armstrong','2345', 'Employee1','2015-09-17',2300,700
INSERT INTO #Sales SELECT 'Deli Armstrong','2345', 'Employee1','2015-09-11',5000,1000
INSERT INTO #Sales SELECT 'Ali Mezzu','6789', 'Employee1','2015-09-07',300,200
Selecting #Sales
I need to add the customer subtotal just below customer occurrences and total in the end row of table like this:
what I've tried so far:
select
case
when GROUPING(CustomerName) = 1 and
GROUPING(Employee) = 1 and
GROUPING(DocDate) = 1 and
GROUPING(LegalID) = 0 then 'Total ' + CustomerName
when GROUPING(CustomerName) = 1 and
GROUPING(Employee) = 1 and
GROUPING(DocDate) =1 and
GROUPING(LegalID) = 1 then 'Total'
else CustomerName end as CustomerName,
LegalID, Employee,DocDate,
sum(DocTotal) as DocTotal,
sum(DueTotal) as DueTotal
From #Sales
group by LegalID, CustomerName,Employee,DocDate with rollup
But I am getting subtotal as null where it should say Total Jhon Titor as I set it static in the query, also it is repeated for every not aggregated column (3),
How can I add subtotal and total to the table presented above?
I am open to use a query without ROLLUP operator. I think it is possible using unions but don't know how to start.
Thanks for considering my question.

Answer 1

I think this is what you want:
select (case when GROUPING(CustomerName) = 0 and
GROUPING(Employee) = 1 and
GROUPING(DocDate) = 1 and
GROUPING(LegalID) = 1
then 'Total ' + CustomerName
when GROUPING(CustomerName) = 1 and
GROUPING(Employee) = 1 and
GROUPING(DocDate) =1 and
GROUPING(LegalID) = 1 then 'Total'
else CustomerName
end) as CustomerName,
LegalID, Employee,DocDate,
sum(DocTotal) as DocTotal,
sum(DueTotal) as DueTotal
From #Sales
group by grouping sets((LegalID, CustomerName ,Employee, DocDate),
(CustomerName),
()
);

Answer 2

You can use the following query:
SELECT CustomerName, LegalID, Employee, DocDate, DocTotal, DueTotal
FROM (
SELECT CustomerName AS cName, CustomerName,
LegalID, Employee, DocDate, DocTotal, DueTotal,
1 AS ord
FROM Sales
UNION ALL
SELECT CustomerName AS cName, CONCAT('Total ', CustomerName),
NULL, NULL, NULL,
SUM(DocTotal), SUM(DueTotal), 2 AS ord
FROM Sales
GROUP BY CustomerName
UNION ALL
SELECT 'ZZZZ' AS cName, 'Total', NULL, NULL, NULL,
SUM(DocTotal), SUM(DueTotal), 3 AS ord
FROM Sales ) AS t
ORDER BY cName, ord
Demo here