多选题
Click the Exhibit button and examine the data from the EMP table. The COMMISSION column shows the monthly commission earned by the employee. Which three tasks would require subqueries or joins in order to be performed in a single step?（） 
发布日期：2021-01-28
deleting the records of employees who do not earn commission
increasing the commission of employee 3 by the average commission earned in department 20
finding the number of employees who do NOT earn commission and are working for department 20
inserting into the table a new employee 10 who works for department 20 and earns a commission that is equal to the commission earned by employee 3
creating a table called COMMISSION that has the same structure and data as the columns EMP_ID and COMMISSION of the EMP table
decreasing the commission by 150 for the employees who are working in department 30 and earning a commission of more than 800
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