mysql - Site has been hacked via SQL Injection - Stack Overflow
0x31303235343830303536 is NULL - they are just matching the number of columns in your existing query. If you had SELECT * FROM users and users had 4 columns, the UNION must also have 4 columns. As a result, they just used `NULL values to populate those columns.
qndbq1bbxilyCzFA') UNION ALL SELECT NULL... - Pastebin.com
qndbq7bbxilyCzFA') UNION ALL SELECT NULL,NULL,NULL,CONCAT(0x716e646271,IFNULL(CAST(grantee AS CHAR),0x20),0x716a716771),NULL FROM INFORMATION_SCHEMA.USER_PRIVILEGES#qjqgq.
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...
sql - Counting null values as unique value - Stack Overflow
How can I count null values as 1 value and use distinct to avoid count repeated values? I'm learning advanced SQL, they want me these requirements for all the solutions
MySQL CONCAT() Function
SELECT CONCAT("SQL ", "Tutorial ", "is ", "fun!") AS ConcatenatedString; Try it Yourself ». Definition and Usage. The CONCAT() function adds two or more expressions together. Note: Also look at the CONCAT_WS() function.
ISNULL (Transact-SQL) - SQL Server | Microsoft Docs
В.C. Проверка значений NULL в предложении WHERETesting for NULL in a WHERE clause. Не используйте для поиска значений NULL выражение
Шпаргалка по SQL инъекциям | DefconRU
(M): SELECT CONCAT(login, password) FROM members. 7. Строки без кавычек Есть несколько
SQL is null and = null - Stack Overflow
NULL is not a value, and therefore cannot be compared to another value. where x is null checks whether x is a null value.
Внедрение SQL-кода — Википедия
SELECT * FROM news WHERE id_news = 5. Но если злоумышленник передаст в качестве параметра id строку -1 OR 1=1 (например, так: http
MySQL :: MySQL 8.0 Reference Manual :: 12.5 String Functions and...
CONCAT() returns NULL if any argument is NULL. mysql> SELECT CONCAT('My', 'S', 'QL')