Suppose the following tables are part of a project management database of a company, where keys are underlined: E(ssn, name, salary) stores the information of employees, P(pid, title, budget) stores the information of projects, and M(ssn, pid, start, end) stores the information of management of projects by employees.

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6) Write an SQL query to return the ssns of employees that managed at most 1 project 7) Write an SQL query to return the ssns of employees that managed no project in last 6 8) Write an SQL query to return the name of employees that managed only 1 project which 9) Write a SQl query to give everyone a 10% salary who managed 2 projects to completion 10) Write an SQL query to delete all the projects from table P that are NOT managed by any completed or ongoing in last 6 months. months. completed 2 years ago. in last year employee