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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

sql - Counting null values as unique value - Stack Overflow

stackoverflow.com

Hours 1 1 2 null null null. The result must be: 3. My query is: select count(distinct hour) from hours; but it returns: 2. I tested also

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.

sql - Informix: Select null problem - Stack Overflow

stackoverflow.com

SELECT CAST(NULL AS INTEGER) FROM dual; And, if you don't have dual as a table (you probably don't), you can do one of a few things

sql server - Why does COUNT() aggregate return 0 for 'NULL'?

dba.stackexchange.com

SELECT ColA FROM TableA WHERE ColA IS NULL. I get 47 rows that have 'NULL' for ColA within TableA. ColA NULL NULL NULL etc...

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 that isn’t always as intuitive as many people think. Whenever using COUNT or DISTINCT, make sure to test with NULLs to make...

SQL Tip: COUNTing NULL values – Benjamin's Blog

sqlbenjamin.wordpress.com

· Using SELECT COUNT(*) or SELECT COUNT(1) (which is what I prefer to use) will return the total of all records returned in the result set regardless of NULL values.

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.

whatsapp windows 8 problem" and(/select 1 /from(/select count(),/concat((/select(/select /unhex(/)/**/union/**/all/**/select/**/null,null,null,null--/**/jqyq/hex(/concat(0x217e21,0x4142433134355a5136324457514146504f4959434644,0x217e21)))) /from i на YouTube:

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