select emp_no, count(emp_no) as t from salaries group by emp_no having t > 15;
用到了 group by进行emp_no的分组
同时用到了having 即在结果中进行过滤
select emp_no, count(emp_no) as t from salaries group by emp_no having t > 15;
用到了 group by进行emp_no的分组
同时用到了having 即在结果中进行过滤
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