kalialee570 kalialee570
  • 25-04-2024
  • Computers and Technology
contestada

Using the familiar Company Database, which SQL query finds the number of employees that have a supervisor?
1) SELECT SSN FROM Employee
2) SELECT SSN FROM Employee WHERE SuperSSN IS NOT NULL
3) SELECT SuperSSN FROM Employee
4) SELECT COUNT(SuperSSN) FROM Employee WHERE SuperSSN IS NOT NULL

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