SQL/Window Function at main · santanudeb/SQL · GitHub

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xxx==============================================================================================================xxx

SELECT dem.FirstName, Gender, AVG(Salary) OVER(PARTITION BY Gender)
FROM EmployeeDemographics AS dem
JOIN EmployeeSalary as sal
 ON dem.EmployeeID = sal.EmployeeID
;

xxx==============================================================================================================xxx

SELECT dem.FirstName, Gender, SUM(Salary) OVER(PARTITION BY Gender)
FROM EmployeeDemographics AS dem
JOIN EmployeeSalary as sal
 ON dem.EmployeeID = sal.EmployeeID
;

xxx==============================================================================================================xxx

[Rolling total increases with next group by value]

SELECT dem.FirstName, Gender, Salary,
SUM(Salary) OVER(PARTITION BY Gender ORDER BY dem.EmployeeID) as Rolling_Total
FROM EmployeeDemographics AS dem
JOIN EmployeeSalary as sal
 ON dem.EmployeeID = sal.EmployeeID
;

xxx==============================================================================================================xxx

SELECT dem.EmployeeID, dem.FirstName, Gender, Salary,
ROW_NUMBER() OVER(PARTITION BY Gender)
FROM EmployeeDemographics AS dem
JOIN EmployeeSalary as sal
 ON dem.EmployeeID = sal.EmployeeID
;

xxx==============================================================================================================xxx

SELECT dem.EmployeeID, dem.FirstName, Gender, Salary,
ROW_NUMBER() OVER(PARTITION BY Gender ORDER BY Salary DESC) as row_num
FROM EmployeeDemographics AS dem
JOIN EmployeeSalary as sal
 ON dem.EmployeeID = sal.EmployeeID
;

xxx==============================================================================================================xxx

SELECT dem.EmployeeID, dem.FirstName, Gender, Salary,
RANK() OVER(PARTITION BY Gender ORDER BY Salary DESC) as rank_num
FROM EmployeeDemographics AS dem
JOIN EmployeeSalary as sal
 ON dem.EmployeeID = sal.EmployeeID
;

xxx==============================================================================================================xxx

SELECT dem.EmployeeID, dem.FirstName, Gender, Salary,
DENSE_RANK() OVER(PARTITION BY Gender ORDER BY Salary DESC) as dense_rank_num
FROM EmployeeDemographics AS dem
JOIN EmployeeSalary as sal
 ON dem.EmployeeID = sal.EmployeeID
;

xxx==============================================================================================================xxx