sql，SELECT * FROM employees WHERE department_id IN (SELECT id FROM departments WHERE name = 'Sales');，`，，这个例子中，内层子查询 (SELECT id FROM departments WHERE name = 'Sales')` 首先找到销售部门的所有 ID，然后外层查询使用这些 ID 来筛选员工表中属于销售部门的员工。sql，SELECT * FROM employees WHERE department_id IN (SELECT id FROM departments WHERE name = 'Sales');，`，，这个例子中，内层子查询 (SELECT id FROM departments WHERE name = 'Sales')` 首先找到销售部门的所有 ID，然后外层查询使用这些 ID 来筛选员工表中属于销售部门的员工。Powered By Z-BlogPHP 1.7.3
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