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SQL using If Not Null on a Concatenation - Stack Overflow
Since a NULL concatenated with a string yields a NULL, we can attempt to build our sub-string and replace a NULL with an empty string, which is then concatenated to the next part of the name. This assumes that FirstName and Surname are always NOT NULL, but you could apply the same logic to...
Confusing SQL error in SELECT NULL, *, NULL, NULL - Stack Overflow
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
sql injection "union select null" - CodeProject
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...
PayloadsAllTheThings/MySQL Injection.md at master...
(select 1 and row(1,1)>(select count(*),concat(CONCAT(@@VERSION),0x3a,floor(rand()*2))x from (select 1 union select 2)a group by x limit 1)) '+(select 1
Шпаргалка по SQL инъекциям | DefconRU
(M): SELECT CONCAT(login, password) FROM members. 7. Строки без кавычек Есть несколько способов не использовать кавычки в запросе, например с помощью CHAR() (MS) и CONCAT() (M). Синтаксис: SELECT 0x457578 (M). В MySQL есть простой способ представления строки в...
COUNT, DISTINCT, and NULLs - SQL with Bert
Viewing and COUNTing the NULLs. Sometimes we might have to do the opposite of what the
SQL Count not null values in every table column - Softhints
Count by single select query. Oracle count null and not null values for several columns. If you need to check the number of null values per column for tables with many columns or for many tables you can use meta database meta information. In most databases there is technical and statistical information.
25 примеров команды SELECT в MySQL | ИТ Блог.
Если вы используете базу данных MySQL, это очень важно, чтобы вы работали комфортно с командной строкой MySQL.На этом уроке мы расскажем, как использовать команду SELECT в MySQL с несколькими...
Уязвимость SQL-инъекция (ч. 1): Основы SQLi, простая инъекция...
Объединение запросов с UNION SELECT.
Заметка про NULL / Хабр | select col from ttt where col is not null
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами.