请你查找薪水记录超过15次的员工号emp_no以及其对应的记录次数tselect emp_no, count(emp_no) as t from salariesgroup by emp_nohaving t>15；用where查询报错，为什么？暂留以后答错误语句：select emp_no, count(emp_no) as t from salarieswhere (select count(distinct salary) from salaries) > 15group by emp_no
