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## Example files for the title:  

# Up and Running with Microsoft SQL Server, by Wes Higbee

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use AdventureWorks2014;

--Find employees with at least one pay raise

select BusinessEntityID, count(*) from HumanResources.EmployeePayHistory

	group by BusinessEntityID

	having count(*) > 1

-- Average of all pay rate history (including past salaries)

select E.Gender, avg(EPH.Rate)

	from HumanResources.Employee as E

	inner join HumanResources.EmployeePayHistory EPH

		on E.BusinessEntityID = EPH.BusinessEntityID

	group by E.Gender

-- Average of only current pay rates

select E.Gender, avg(EPH.Rate) AverageCurrentPayRate

	from HumanResources.EmployeePayHistory EPH

	inner join HumanResources.Employee E on E.BusinessEntityID = EPH.BusinessEntityID

  inner join

	 (select BusinessEntityID, max(RateChangeDate) as CurrentRateChangeDate

		 from HumanResources.EmployeePayHistory

		group by BusinessEntityID) CurrentPayChangeDate

		on CurrentPayChangeDate.BusinessEntityID = EPH.BusinessEntityID

			and CurrentPayChangeDate.CurrentRateChangeDate = EPH.RateChangeDate

	group by Gender

-- Query with variables (uncomment where clauses below)

declare @employeeId int

set @employeeId = 16

-- Query pay history to validate data

select BusinessEntityID, Rate, RateChangeDate from HumanResources.EmployeePayHistory 

--where BusinessEntityID = @employeeId

order by BusinessEntityID, RateChangeDate desc

-- Query current pay history records only

select EPH.BusinessEntityID, EPH.Rate CurrentPayRate

	from HumanResources.EmployeePayHistory EPH

  inner join

	 (select BusinessEntityID, max(RateChangeDate) as CurrentRateChangeDate

		 from HumanResources.EmployeePayHistory

		--where BusinessEntityID = @employeeId

		group by BusinessEntityID) CurrentPayChangeDate

		on CurrentPayChangeDate.BusinessEntityID = EPH.BusinessEntityID

			and CurrentPayChangeDate.CurrentRateChangeDate = EPH.RateChangeDate

	order by BusinessEntityID, RateChangeDate desc

-- Query of column descriptions for EmployeePayHistory table

SELECT *

FROM fn_listextendedproperty (NULL, 'schema', 'HumanResources', 'table', 'EmployeePayHistory', 'column', default);

-- REFACTOR TO COMMON TABLE EXPRESSION

With CurrentEmployeePayHistory AS (

	select EPH.* from HumanResources.EmployeePayHistory EPH

		inner join (select BusinessEntityID, max(RateChangeDate) as CurrentRateChangeDate

						from HumanResources.EmployeePayHistory

						group by BusinessEntityID) CPCD

			on CPCD.BusinessEntityID = EPH.BusinessEntityID and CPCD.CurrentRateChangeDate = EPH.RateChangeDate

)

-- Average of only current pay rates

select Gender, E.OrganizationLevel, avg(CEPH.Rate) AverageCurrentPayRate, count(*)

	from CurrentEmployeePayHistory CEPH

	inner join HumanResources.Employee E on E.BusinessEntityID = CEPH.BusinessEntityID

	group by Gender, OrganizationLevel

	order by OrganizationLevel, Gender

-- COMPUTE GAP IN PAY

With CurrentEmployeePayHistory AS (

	select EPH.* from HumanResources.EmployeePayHistory EPH

		inner join (select BusinessEntityID, max(RateChangeDate) as CurrentRateChangeDate

						from HumanResources.EmployeePayHistory

						group by BusinessEntityID) CPCD

			on CPCD.BusinessEntityID = EPH.BusinessEntityID and CPCD.CurrentRateChangeDate = EPH.RateChangeDate

)

-- Average of only current pay rates

select E.OrganizationLevel, avg(CEPH.Rate) AverageCurrentPayRate, count(*),

	-- Male Average Pay Rate 

	--SUM(Rate) as TotalRate,

	--SUM(CASE WHEN Gender='M' THEN Rate END) as MaleTotalRate,

	--SUM(CASE WHEN Gender='M' THEN 1 END) as MaleTotalCount,

	SUM(CASE WHEN Gender='M' THEN Rate END) / SUM(CASE WHEN Gender='M' THEN 1 END) as MaleAvgPayRate,

	-- Female Average Pay Rate

	--SUM(CASE WHEN Gender='F' THEN Rate END) as FemaleTotalRate,

	--SUM(CASE WHEN Gender='F' THEN 1 END) as FemaleTotalCount,

	SUM(CASE WHEN Gender='F' THEN Rate END) / SUM(CASE WHEN Gender='F' THEN 1 END) as FemaleAvgPayRate,

	-- Gap In Pay ( Male Average Pay Rate - Female Average Pay Rate)

	SUM(CASE WHEN Gender='M' THEN Rate END) / SUM(CASE WHEN Gender='M' THEN 1 END) -

		SUM(CASE WHEN Gender='F' THEN Rate END) / SUM(CASE WHEN Gender='F' THEN 1 END) as GapMaleToFemale

	from CurrentEmployeePayHistory CEPH

	inner join HumanResources.Employee E on E.BusinessEntityID = CEPH.BusinessEntityID

	group by OrganizationLevel

	order by OrganizationLevel

--RANK FUNCTIONS EXAMPLE

With CurrentEmployeePayHistory AS (

	select * from 

		(select EPH.*,

			ROW_NUMBER() OVER (PARTITION BY BusinessEntityId ORDER BY RateChangeDate desc) as RowNumber

			from HumanResources.EmployeePayHistory EPH) CEPH

		where RowNumber = 1

)

-- Average of only current pay rates

select E.OrganizationLevel, avg(CEPH.Rate) AverageCurrentPayRate, count(*),

	-- Male Average Pay Rate 

	--SUM(Rate) as TotalRate,

	--SUM(CASE WHEN Gender='M' THEN Rate END) as MaleTotalRate,

	--SUM(CASE WHEN Gender='M' THEN 1 END) as MaleTotalCount,

	SUM(CASE WHEN Gender='M' THEN Rate END) / SUM(CASE WHEN Gender='M' THEN 1 END) as MaleAvgPayRate,

	-- Female Average Pay Rate

	--SUM(CASE WHEN Gender='F' THEN Rate END) as FemaleTotalRate,

	--SUM(CASE WHEN Gender='F' THEN 1 END) as FemaleTotalCount,

	SUM(CASE WHEN Gender='F' THEN Rate END) / SUM(CASE WHEN Gender='F' THEN 1 END) as FemaleAvgPayRate,

	-- Gap In Pay ( Male Average Pay Rate - Female Average Pay Rate)

	SUM(CASE WHEN Gender='M' THEN Rate END) / SUM(CASE WHEN Gender='M' THEN 1 END) -

		SUM(CASE WHEN Gender='F' THEN Rate END) / SUM(CASE WHEN Gender='F' THEN 1 END) as GapMaleToFemale

	from CurrentEmployeePayHistory CEPH

	inner join HumanResources.Employee E on E.BusinessEntityID = CEPH.BusinessEntityID

	group by OrganizationLevel

	order by OrganizationLevel

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