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SELECT * FROM employees WHERE salary <= 12000
SELECT last_name, department_id FROM employees WHERE department_id != 90
SELECT salary, last_name FROM employees WHERE salary >= 10000 AND salary <= 20000
SELECT * FROM employees WHERE NOT(department_id >=90 AND department_id <=110) OR salary > 15000
SELECT * FROM employees WHERE last_name LIKE '%a%'
SELECT salary, last_name FROM employees WHERE last_name LIKE "__a_c%"
SELECT last_name FROM employees WHERE last_name LIKE "_\_%"
SELECT last_name FROM employees WHERE last_name LIKE "_$_%" ESCAPE '$'
SELECT * FROM employees WHERE salary BETWEEN 15000 AND 20000
SELECT last_name, job_id FROM employees WHERE job_id IN ('IT_PROT','AD_VP')
SELECT last_name, commission_pct FROM employees WHERE commission_pct IS NULL
SELECT last_name, commission_pct FROM employees WHERE commission_pct <=> NULL
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