select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null
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Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. this instruction is used in sql injection I tried it and it worked but I didn't really know how it works can somebody help me...
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...SELECT NULL,NULL,NULL,version(),NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL
‘union all select’ : combines two or more select statements into one query and returns all rows ‘order by’ : used to sort
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...par=1 or (select count(*)from(select 1 union select 2 union select 3)x group by concat(mid((select pass from users limit 1),1
And as we learned earlier, no NULL value can satisfy an equality condition, so the records from a