sql - Union to handle NULL values - Stack Overflow ... Try to search 999999 9' union all select cast(0x393133353134353632312e39 as char)
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999999.9 union all select cast0x393133353134353632312e39 as char and 0=0.
UNION ALL. SELECT NULL, NULL, NULL, NULL, NULL, NULL, cast(Description as char(100)), CaseDetailId. FROM CaseActionDefinition JOIN CaseActionHistory AS C ON DefinitionId = C.CaseActionDefinitionId. WHERE DefinitionId BETWEEN 70 AND 78) AS x.
For a style value of NULL, NULL is returned. data_type determines the range.
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...
Note: A NULL value is different from a zero value or a field that contains spaces.
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.
Когда значение поля есть NULL — это значит, что программа базы данных специальным образом помечает поле, как не содержащее какого-либо значения для
NULL в Системах управления базами данных (СУБД) — специальное значение (псевдозначение), которое может быть записано в поле таблицы базы данных (БД). NULL соответствует понятию «пустое поле», то есть «поле, не содержащее никакого значения».