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sql injection "union select null" - CodeProject

www.codeproject.com

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...

Confusing SQL error in SELECT NULL, *, NULL, NULL - Stack Overflow

stackoverflow.com

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

Шпаргалка по SQL инъекциям | DefconRU

defcon.ru

(M): SELECT CONCAT(login, password) FROM members. 7. Строки без кавычек Есть несколько

mysql - Return 0 when SELECT COUNT is null - Stack Overflow

stackoverflow.com

SELECT m.id, m.name, m.description, m.directions, COUNT(j.markerid) as marker_jingles FROM markers AS m LEFT OUTER JOIN jingles AS j ON j.markerid=m.id WHERE 1. But am a bit stuck because I cannot figure out how to get it to return rows when the COUNT is 0.

Заметка про NULL / Хабр | select col from ttt where col is not null

habr.com

Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами.

SQL Инъекции | Page 798 | ANTICHAT - Security online community

forum.antichat.ru

http://www.indianamri.com/index.php?page=Indiana_MRI_Bloomington_-_MRI_Services_for_Bloomington_and_Southern_Indiana_Magnetic_Resonance_Imaging&menu_id=1'+limit+0+UNION+SELECT+1,concat_ws(0x3a,user(),version(),database())+

COUNT, DISTINCT, and NULLs - SQL with Bert

bertwagner.com

returns non null values in group */ SELECT COUNT(Col1) FROM ##TestData; Because of this, COUNT, DISTINCT, and NULLs have a special relationship with each other

Команда IS NOT NULL - проверка поля на не NULL | Трепачёв...

old.code.mu

Пример: SELECT * FROM workers WHERE salary IS NOT NULL.

SQL NULL Values - IS NULL and IS NOT NULL

www.w3schools.com

String Functions ASCII Char Charindex Concat Concat with + Concat_WS Datalength Difference

SQL Tip: COUNTing NULL values – Benjamin's Blog

sqlbenjamin.wordpress.com

I've been asked about counting NULL values several times so I'm going to blog about it in hopes others will be helped by this explanation of NULL values in

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