Description
Can someone help me the question I attached the file below in word. I got stuck some where
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1. Determine the Appropriate Command and Write a QUERY:
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The employees table and job history table both have similar columns.
Please write a queries that performs a UNION of the data that you choose to select.
Make sure to suppress any duplicates when doing this.
My Query:
Select EMPLOYEE_ID, JOB_ID, DEPARTMENT_ID
From EMPLOYEES
Union
Select EMPLOYEE_ID, JOB_ID, DEPARTMENT_ID
From JOB_HISTORY;
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How does this differ from if you were to run these two queries individually?
2. Determine the Appropriate Function and Write a QUERY:
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Choose a table that has a column with a number data type. Make sure this column
is one that makes sense to take the average of.
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Then return the rounded average of that column.
GROUP the data by another column in the table.
Choose the fields for your query.
My Query:
Select MAX_SALARY, ROUND(AVG(MAX_SALARY)) AS Average_MAX_SALARY
From JOBS
Group by MAX_SALARY;
3. Determine the Appropriate Function and Write a QUERY:
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Add the HAVING Clause to your Query in Problem #2.
Explain what the HAVING Clause did as a result of you adding it to the Query.
4. Determine the Appropriate Command and Write a QUERY:
─ Redo problem #2, to not suppress any duplicates.
─ What did you notice about the change of results.
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