题解 | #针对上面的salaries表emp_no字段创建索引idx_emp_no#
针对上面的salaries表emp_no字段创建索引idx_emp_no
http://www.nowcoder.com/practice/f9fa9dc1a1fc4130b08e26c22c7a1e5f
强制索引force index(index_name)要加在select。。。from。。。后面
select * from salaries force index (idx_emp_no)
where emp_no = 10005