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#166. Examine the data in the EMPLOYEES table.
On the EMPLOYEES table, EMPLOYEE_ID is the primary key. MGR_ID is the ID of managers and refers to the EMPLOYEE_ID. The JOB_ID column is a NOT NULL column.
Evaluate this DELETE statement: DELETE employee_id, salary, job_id FROM employees WHERE dept_id = 90;
Why does the DELETE statement fail when you execute it?
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