1.1SQL查询代码如下:
select job as 工作类别,count(job) as 人数 from tb_emp
where entrydate <2015-01-01
group by job
having count(job) > 2
order by count(job)
limit 1,1where entrydate <‘2015-01-01’ 表示查询日期小于2015-01-01的记录…
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时间复杂度大小比较
1.time complexity of algorithm A is O(n^3) while algorithm B is O(2^n). Which o…