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Нашёл 3 млн ответов for 'college strategies UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL-- rheU'.

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. Two null pointer values of the same type shall compare equal. The conversion of a null pointer constant to a pointer to cv-qualified type is a single conver-sion, and not the sequence of...

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

Microsoft Word - Blindfolded SQL Injection - Final.doc
Once the NULL-based UNION statement works, it is a trivial process to identify the types of each column. In each iteration a single field is tested for its type. All three types (number, integer, string) are tested for the field, one of them should work. This way, it takes up to three times the number of...

http://injection.rulezz.ru/Blindfolded_SQL_Injection.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

Exploiting Webapps using Oracle Databases
SELECT firstname, lastname FROM customers UNION SELECT username, null FROM ALL_USERS ORDER BY 1,2. The most common techniques are the usage of "ORDER BY" or adding NULL values to the second query. SELECT * FROM table UNION.

http://www.red-database-security.com/wp/oracle_sql_injection_2009.pdf

Nulls in SQL
• SQL use 3 truth values: true, false, unknown. • (NULL=20), NULL+5, NULL< a have value unknown • unknown AND true = unknown • unknown OR true = true, ... Logical operations can be explained concisely by equating. true=1, false=0, unknown=0.5, and defining functions and(x,y) = min(x,y) or(x...

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

Using the Set Operators | UNION ALL
When multiple SELECT queries are joined using UNION operator, Oracle displays the combined result from all the compounded SELECT queries,after removing all duplicates and in sorted order ascendingbydefault, without ignoring the NULL values.

https://www.tutorialspoint.com/sql_certificate/pdf/using_the_set_operators.pdf

SQL - unions clause
The SQL UNION clause/operator is used to combine the results of two or more SELECT statements without returning any duplicate rows. To use UNION, each SELECT must have the same number of columns selected, the same number of column expressions, the same data type...

http://www.tutorialspoint.com/sql/pdf/sql-unions-clause.pdf

e0087test.fm
The extra condition “IS NOT NULL” is necessary since the column S_CID could contain NULLs: the “NOT IN” condition would be perpetually false is the list The first query lists all “planned” courses, but the second doesn’t list anything since the S_CID is never NULL for the current content of the table.

https://www.abis.be/resources/coursetests/e0087test.pdf

Microsoft Word - NULL and Nothing 20161013.docx
True NULLs are cases when an existing record in the data model has a field where the value is This is true both for the external SQL commands (“JOIN” and “UNION”) and for the internal QlikView NULLs are never visible in list boxes and can never be selected. Instead, you have an empty string...

https://community.qlik.com/cyjdu72974/attachments/cyjdu72974/qlikview-documents/4380/1/NULL%20and%20Nothing.pdf