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

064-29: Creating Efficient SQL - Union Join without the Union...
data _null_; merge a b; by key; run; KEY ACOL BCOL p one six q two seven r three eight. The row-wise join returns a single column 'col' instead with a result set containing all the rows of SELECT col FROM a UNION SELECT col FROM b. data _null_; set a b; run

https://support.sas.com/resources/papers/proceedings/proceedings/sugi29/064-29.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

Nulls in SQL
• (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.

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

The OWASP Foundation
1'))) UNION ALL SELECT NULL, Concatenated SQL query# AND ((('RaNd' LIKE 'RaNd. 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

TTCN-3 Quick Reference Card
Selected BNF definitions have links to browseable BNF generated by https SPECIAL TYPES default. address verdicttype objid. EXAMPLES var default v_myAltstep := null reference of component or SUT interface (global scope); null is concrete address value; fixed values: none (default), pass...

https://blukaktus.com/TTCN3QRC_viewme.pdf

Microsoft Word - Blindfolded SQL Injection - Final.doc
This type of NULL injection serves two purposes. The main purpose is to get a working UNION statement that has no errors. Although this UNION still does not retrieve any real data, it provides an indication that the statement indeed works. Another purpose of this empty UNION is to get a 100...

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

Using the Set Operators Questions
When used with two SELECT statements, the UNION set operator returns the results of both queries.However,if there are any duplicates, they are A. It returns rows from the combined queries along with NULL values B. It returns rows for the combined queries after eliminating duplicates C. It...

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

SQL Injection
1234' and account=NULL; -- For mysql, there must be white space after --. You are identified as name userid. – We know account is a valid field name, because. 1234' and acct=NULL; --Unknown column 'acct' in 'where clause'. – Gives a different message. Introduction. Some Attack Strings.

https://www.cs.montana.edu/courses/csci476/topics/sql_injection.pdf