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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

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

sql server - UNION ALL and Nulls / Error - Stack Overflow
Select Pull_Date, Well_Name, MIN(CASE WHEN Part='BODH' THEN 'BODH' ELSE NULL END) [BODH], MIN(CASE WHEN Part You stated that your problem is that AGH is always returning nulls and is populated in the "Part3" fields. If this is the case, you'll need to pull in that data for the "Part3"...

https://stackoverflow.com/questions/32010858/union-all-and-nulls-error

sql - Union to handle NULL values - Stack Overflow
select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f from table3. I do not know how to write an Oracle sql which would fetch me the below output. As shown below, I need not null values to be at the start of all output fields.

https://stackoverflow.com/questions/31958304/union-to-handle-null-values

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

Search results for tap) UNION ALL SELECT NULL... | FSX Add-ons
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http://www.fsxaddons.com/search/?q=tap)%20UNION%20ALL%20SELECT%20NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL--%20BCgU

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 time, and so the two NULLs default to "text" before we ever look at the zero. It's probably possible to rejigger it so that the...

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

Oracle NULLIF Function By Practical Examples
It returns a null value if the two arguments are equal. In this syntax, the e1 cannot be a literal NULL. If both expressions evaluates to numeric values, then Oracle determines the argument with the higher numeric precedence, implicitly converts the other argument to that data type, and returns a value of...

https://www.oracletutorial.com/oracle-comparison-functions/oracle-nullif/