SELECT CAST (miles AS INT) FROM Flights -- convert timestamps to text INSERT INTO mytable (text_column) VALUES ...
data2(id, val) as (select 1, null from dual union all select 2, '2' from dual).
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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In general, R supports: NULL NA NaN Inf / -Inf NULL is an object and is returned when an
union all select null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null
SQL supports NULL, a special value that is employed to represent the values of attributes that will be unknown or not apply to a tuple.
Note: A NULL value is different from a zero value or a field that contains spaces.
Оператор объединения с NULL ?? возвращает значение своего операнда слева, если его значение не равно null.
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.