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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...

https://www.codeproject.com/Questions/439817/sql-injection-union-select-null

sql - How null is treated using union and union all in... - Stack Overflow
NB : null = null is unknown, however null <> null is unknown as well. The only way to check for nullity is to use something like IS NULL. (emphasis mine). So, in this example: select null union all select null. the two rows are considered duplicates of each other because the null values in first column are...

https://stackoverflow.com/questions/53956546/how-null-is-treated-using-union-and-union-all-in-mysql

How to select null when the record does not exist with UNION ALL?
How can I make the SELECT UNION display a NULL instead of a blank when the record does not exist? Is it possible to do the same but when I require a JOIN with several tables? Let's say that I need to extract the number of subjects that is in another table X (therefore due to make a JOIN between the...

https://stackoverflow.com/questions/48964459/how-to-select-null-when-the-record-does-not-exist-with-union-all

mysql - Exclude null results on a UNION query - Stack Overflow
SELECT DISTINCT(provider) FROM (SELECT title, provider FROM financials_raw. UNION. SELECT title, provider from sales_raw ) combined. WHERE title = 'Home'. However, this will return NULL provider results as well, how would I exclude all null results?

https://stackoverflow.com/questions/10804536/exclude-null-results-on-a-union-query

php - A customers site had a big mysql injection attack on it, just want...
Number of null-s on change between passed and failed queries is the one attacker looks for. Seems useless to me, but it can determine how many columns you have since this will throw an error if the number of null doesn't match the number of columns you have.

https://security.stackexchange.com/questions/34913/a-customers-site-had-a-big-mysql-injection-attack-on-it-just-want-to-learn-from

SQLmap injection not working, manually it works fine - Information...
NULL,NULL-- [PAYLOAD] admin' UNION ALL SELECT NULL,NULL,NULL,NULL--. EDIT: This query also works manually: ' union select table_name,2,3,4,5,6,7,8,9,10,11,12 from information_schema.tables where 'x'='x. However, SQLmap doesn't seem to test unions like that.

https://security.stackexchange.com/questions/103346/sqlmap-injection-not-working-manually-it-works-fine

SQL injection: how to find urls to attack to - Information Security Stack...
The UNION ALL is quite useful, you can join another SQL request by using it. For instance, let's translate again this URL part into SQL We get a very valuable information: the number of column the product's table have. When using the UNION ALL operator, the table's column number has to be the...

https://security.stackexchange.com/questions/173459/sql-injection-how-to-find-urls-to-attack-to

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Union Based Injection | NetSPI SQL Injection Wiki
SELECT user UNION (SELECT @@version). Union null Note: If original query returns more than one column, add Union null binary halving Note: This query is used to detect the number of columns. Too many columns returns an error, find the [numberOfColumns]...

https://sqlwiki.netspi.com/injectionTypes/unionBased/

Обсуждение: BUG #1453: NULLs in UNION query
SELECT NULL AS Test UNION ALL (SELECT NULL UNION ALL SELECT 0). The problem is that transformSetOperationTree() resolves the column datatypes one UNION pair at a As a workaround, perhaps you could cast one or all of the nulls to int explicitly

https://postgrespro.ru/list/thread-id/1203079