单选题
发布日期:2020-04-10
SELECT COUNT (*) FROM employees WHERE last _name='smith';
SELECT COUNT (dept_id) FROM employees WHERE last _name='smith';
SELECT DISTINCT (COUNT (dept_id) FROM employees WHERE last _name='smith';
SELECT COUNT (DISTINCT dept_id) FROM employees WHERE last _name='smith';
SELECT UNIQE (dept_id) FROM employees WHERE last _name='smith';
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