sql - Union to handle NULL values - Stack Overflow ... Try to search 999999 9' union all select cast(0x393133353134353632312e39 as char)
999999.9 union all select cast0x393133353134353632312e39 as char and 0=0.
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.
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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...
For a style value of NULL, NULL is returned. data_type determines the range.
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.
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами.