Cube in SQL Server

group by cube in sql server 2008
cube group by sql
sql server group by cube example
sql server cube group by

Cube() in SQL Server produces the result set by generating all combinations of columns specified in GROUP BY CUBE().

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Let us understand Cube() in SQL Server with examples. Write a query to retrieve Sum of Salary grouped by all combinations of the following 2 columns as well as Grand Total.
Country,
Gender

Using Cube with Group By
SELECT Country, Gender, SUM(Salary) AS TotalSalary
FROM Employees
GROUP BY Cube(Country, Gender)

--OR

SELECT Country, Gender, SUM(Salary) AS TotalSalary
FROM Employees
GROUP BY Country, Gender with Cube

The above query is equivalent to the following Grouping Sets query.

SELECT Country, Gender, SUM(Salary) AS TotalSalary
FROM Employees
GROUP BY
GROUPING SETS
(
(Country, Gender),
(Country),
(Gender),
()
)

The above query is equivalent to the following UNION ALL query. While the data in the result set is the same, the ordering is not. Use ORDER BY to control the ordering of rows in the result set.

SELECT Country, Gender, SUM(Salary) AS TotalSalary
FROM Employees
GROUP BY Country, Gender

UNION ALL

SELECT Country, NULL, SUM(Salary) AS TotalSalary
FROM Employees
GROUP BY Country

UNION ALL

SELECT NULL, Gender, SUM(Salary) AS TotalSalary
FROM Employees
GROUP BY Gender

UNION ALL

SELECT NULL, NULL, SUM(Salary) AS TotalSalary
FROM Employees

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