select cast (2000 as type of quint) from rdb$database select cast (2000 as int) from rdb$database.
select cast (2000 as type of quint) from rdb$database select cast (2000 as int) from rdb$database. If TYPE OF is used with a (VAR)CHAR type, its character.
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.
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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...
2 union all select 3) as N1 cross join
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For a style value of NULL, NULL is returned. data_type determines the range.
Символ null по сей день используется во многих языках программирования (как признак конца строки) и обозначается «\0». (Термин «строка» обозначает последовательность символов.) В некоторых операционных системах, null — последний символ любого текстового файла.