UNION

$*$ NOTE UNION COMPATIBILITY for both UNION and DIFF

Ex$.1$

EmployeeID FirstName LastName Department ContractorID FirstName LastName Department

$1$ John Smith HR $101$ Laura Lee IT

$2$ Jane Doe IT $102$ David Brown Finance

$3$ Michael Johnson Sales $103$ Emma White HR

Ex$.2$

OrderID Product Quantity OrderID Product Quantity

$1$ Laptop $23$ Tablet $1$

$2$ Smartphone $34$ Headphones $5$

$3$ Tablet $15$ Laptop $2$