UNION ALL SELECT NULL, *, NULL, NULL FROM email. I understand what this does and why; the hacker needs to create a query that has the same number
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...
select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f from table3.
SELECT column_names FROM table_name WHERE column_name IS NOT NULL; Demo Database.
Command (m for help): a Selected partition 1.
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Соответственно, IS NOT NULL действует наоборот: вернёт истину, если значение операнда отлично от NULLа и ложь, если он является
(M): SELECT CONCAT(login, password) FROM members. 7. Строки без кавычек Есть несколько
Все записи со значением NULL в столбце 50 таблицы Weight заменяются значением Product.It substitutes the value 50 for all
Because the result of any arithmetic comparison with NULL is also NULL, you cannot obtain any meaningful results from such comparisons. In MySQL, 0 or NULL means false and anything else means true. The default truth value from a boolean operation is 1.