Write the SQL code to find the average Assign_Charge by Job_code  from the Assignment table.  Write the SQL code to find the average Assign_Charge by employee  from the Assignment table.   Write the SQL code to find who works  the most and the least with one’s charging_hour  from the Assignment table.  Write the SQL code to find how many employees are in job_code 501. Write the SQL code to find what is the job description of job_code 507 Write the SQL codes to find how many projects  are available.

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