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a - ) Write the query to get the output Employee Name, Employee's Department Name, Employee's Manager Name, Manager's Department Name in relational algebra. Write

a-) Write the query to get the output "Employee Name, Employee's Department Name, Employee's
Manager Name, Manager's Department Name in relational algebra. Write the output of the query.
b-) Write query to find the departments that supply all items of which have an item name starting with
"P" in relational algebra. Write the output of the query.
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