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1. 用mysql选择奇偶数 获取偶数的方法 select * from pos_info_report_tmp_20110712 r where mod(r.id,2) = 0; 获取奇数的方法 select * from pos_info_report_tmp_20110712 r where mod(r.id,2) = 1; 在hackerrank上面的例子 image.png selectdistinct(city)fromstationwheremod(id,2)=0; 2.求两...
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