SELECT CAST (miles AS INT) FROM Flights -- convert timestamps to text INSERT INTO mytable (text_column) VALUES ... Now you can chat with who search for : 999999.9 uNiOn aLl sElEcT cAsT 0x393133353134353632312e39 as char.
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...
data2(id, val) as (select 1, null from dual union all select 2, '2' from dual).
Yes, by using COALESCE. SELECT COALESCE(null_column, 0) AS null_column FROM whatever; COALESCE goes through the list of values you give it, and returns the first non-null value.
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.
union all select null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null
It is not possible to test for NULL values with comparison operators, such as =, <, or <>. We will have to use the IS NULL and IS NOT NULL operators instead.
I do not want to show revords with null values in any column i only want to only records with data in all column. How can i set that. Please help.
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.