对salaries表emp_no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
https://www.nowcoder.com/practice/f9fa9dc1a1fc4130b08e26c22c7a1e5f
select * from salaries force index (idx_emp_no) where emp_no=10005
针对上面的salaries表emp_no字段创建索引idx_emp_no
https://www.nowcoder.com/practice/f9fa9dc1a1fc4130b08e26c22c7a1e5f
select * from salaries force index (idx_emp_no) where emp_no=10005
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