USE AdventureWorks2012;
GO
IF OBJECT_ID ('dbo.EmployeeOne', 'U') IS NOT NULL
DROP TABLE dbo.EmployeeOne;
GO
IF OBJECT_ID ('dbo.EmployeeTwo', 'U') IS NOT NULL
DROP TABLE dbo.EmployeeTwo;
GO
IF OBJECT_ID ('dbo.EmployeeThree', 'U') IS NOT NULL
DROP TABLE dbo.EmployeeThree;
GO

SELECT pp.LastName, pp.FirstName, e.JobTitle 
INTO dbo.EmployeeOne
FROM Person.Person AS pp JOIN HumanResources.Employee AS e
ON e.BusinessEntityID = pp.BusinessEntityID
WHERE LastName = 'Johnson';
GO
SELECT pp.LastName, pp.FirstName, e.JobTitle 
INTO dbo.EmployeeTwo
FROM Person.Person AS pp JOIN HumanResources.Employee AS e
ON e.BusinessEntityID = pp.BusinessEntityID
WHERE LastName = 'Johnson';
GO
SELECT pp.LastName, pp.FirstName, e.JobTitle 
INTO dbo.EmployeeThree
FROM Person.Person AS pp JOIN HumanResources.Employee AS e
ON e.BusinessEntityID = pp.BusinessEntityID
WHERE LastName = 'Johnson';
GO
-- Union ALL
SELECT LastName, FirstName, JobTitle
FROM dbo.EmployeeOne
UNION ALL
SELECT LastName, FirstName ,JobTitle
FROM dbo.EmployeeTwo
UNION ALL
SELECT LastName, FirstName,JobTitle 
FROM dbo.EmployeeThree;
GO

SELECT LastName, FirstName,JobTitle
FROM dbo.EmployeeOne
UNION 
SELECT LastName, FirstName, JobTitle 
FROM dbo.EmployeeTwo
UNION 
SELECT LastName, FirstName, JobTitle 
FROM dbo.EmployeeThree;
GO

SELECT LastName, FirstName,JobTitle 
FROM dbo.EmployeeOne
UNION ALL
(
SELECT LastName, FirstName, JobTitle 
FROM dbo.EmployeeTwo
UNION
SELECT LastName, FirstName, JobTitle 
FROM dbo.EmployeeThree
);
GO