select extract(month from hiredate) 入职月份,count(*) 人数 from emp
where extract(year from hiredate)='1981' group by extract(month from hiredate) order by 入职月份;
结果：
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select extract(month from hiredate) 入职月份,count(*) 人数 from emp
where extract(year from hiredate)='1981' group by extract(month from hiredate) order by 入职月份;
结果：
相关文章：