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...
select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f from table3.
I need results to be shown in one row instead of few. Query: … I suppose I need to get rid somehow of few things in GROUP BY however I don't really have an idea how to change the query itself to make...
select cast (2000 as type of quint) from rdb$database select cast (2000 as int) from ...
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...
Number of null-s on change between passed and failed queries is the one attacker looks for.
A field with a NULL value is a field with no value. If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this
The null character (also null terminator or null byte) is a control character with the value zero. It is present in many character sets, including ISO/IEC 646 (or ASCII), the C0 control code, the Universal Coded Character Set (or Unicode), and EBCDIC.
Оператор объединения с NULL ?? возвращает значение своего операнда слева, если его значение не равно null.
Соответственно, IS NOT NULL действует наоборот: вернёт истину, если значение операнда отлично от NULLа и ложь, если он является