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Нашёл 3 млн ответов for 'innovative teaching methods UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL-- FwXz'.

Nulls Make Things Easier?
SELECT NULL < NULL + 1; ?column? -(null). NULL represents unknown, not applicable, or unassigned. It has no data type, so comparing it to xed values always returns s. WITH ordertest AS ( SELECT NULL UNION ALL SELECT 2 UNION ALL SELECT 1 UNION ALL SELECT NULL.

https://momjian.us/main/writings/pgsql/nulls.pdf

A name for the null pointer: nullptr (revision
A null pointer constant is an integral constant expression (expr.const) rvalue of integer type that evaluates to zero. A null pointer constant can be converted to In particular: § Distinguishing between null and zero. The null pointer and an integer 0 cannot be distin-guished well for overload resolution.

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf

Null Session Enumeration from a
Null Session Enumeration from a Windows-Based System. The first step in enumerating CIFS/SMB is to connect to the service using the so-called null 10. Repeat step #3, this time selecting Specify Username & Password (use the Administrator user account and password you enumerated in lab #23...

https://www.utc.edu/center-academic-excellence-cyber-defense/pdfs/4660-lab4.pdf

Inserting NULL values into a table and Selecting NULL values
select * from Employee1; -- Employee1 table does NOT have FK constraint superssn to PK ssn, so any value including NULL or ' ' will be accepted but NULL is taken as missing Insert Into Employee1 Values ('James', 'X', 'Brog1', '888660001','10-Nov-27','450 Stone, Houston, TX', 'M','55000', Null,'1')

http://cis.csuohio.edu/~sschung/cis430/HandlingNULLvalues.pdf

Rela7onal Model (Chapter 2) | Null value
Careful with NULLs: select name from instructor where salary < 100000 or salary >= 100000; Wouldn’t return the instructor with NULL salary (if any). Suppose a tuple occurs m times in r and n times in s, then, it occurs: ● m + n times in r union all s ● min(m,n) times in r intersect all s ● max(0, m – n) times...

https://www.cs.umd.edu/class/fall2015/cmsc424/lecture-relational.pdf

Finding More Null
Moreover, we found 24 additional null pointer bugs in Tomcat that had been missed by Reasoning, and overall doubled the number of null pointer bugs found This code will throw a null pointer exception if anyLogging is false and detailedLogging is true. The names of these boolean variables suggest that...

https://findbugs.cs.umd.edu/papers/MoreNullPointerBugs07.pdf

Advanced SQL Injection
2. Use NULL in UNION injections for most data type instead of trying to guess string, date, integer. >0 RAISERROR(''CreateObject %0X'', 14,1,@OLEResult) EXECUTE @OLEResult=sp_OAMethod @ShellID,''Run'',Null,''ping -n 8 127.0.0.1'',0,1IF @OLEResult<>0 SELECT @[email protected] IF...

https://repo.zenk-security.com/Techniques%20d.attaques%20%20.%20%20Failles/Advanced%20SQL%20Injection.pdf

Null Alleles
Definition of Null Allele. ● Concerning DNA markers: A DNA segment of good quality, limited to the two primer pairs of a PCR reaction that doesn't yield a PCR product in some biological samples while all other samples of that kind show a clearly detectable signal with the same PCR reaction.

http://www.dna-fingerprint.com/static/Null-Alleles.pdf

1'))) UNION ALL SELECT NULL, Concatenated SQL query# AND...
ORDER BY clause brute-forcing NULL brute-forcing Sequential number brute-forcing. The number of columns in the SELECT statement is fewer than the number of columns that you want to inject. Front Range OWASP Conference, Denver (USA).

https://www.owasp.org/images/e/ed/SQLinjectionNotOnly.pdf

Nulls in SQL
• What is the effect of operations with null? • What about selection condition age=20 when age is Queries with NULL. The WHERE condition for tuples in a query answer must evaluate to TRUE / 1. Queries with NULL have weird 'logic'. • SELECT e.name FROM Emp e WHERE (e.age>20 OR e.age...

https://www.cs.rutgers.edu/~borgida/cs336/SQL2.Sp17.pdf