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Нашёл 9 млн ответов for 'textbook advertising UNION ALL SELECT NULL,NULL-- IHDy'.

Advanced_SQL_InjectionV2
All queries in an SQL statement containing a UNION operator must have an equal number of expressions in their target lists. Change the first part of the query to a null or negative value so we can see what field will echo data back to us.

https://owasp.org/www-chapter-belgium/assets/2010/2010-06-16/Advanced_SQL_InjectionV2.pdf

OWASPBostonv1
▸ abcd' UNION ALL SELECT NULL,(SELECT. string_agg(table_name,', ') AS tables_list FROM information_schema.tables WHERE ▸ fetch Users and password hashes: ▸ abcd' UNION ALL SELECT NULL,(SELECT. concat(email,' : ',password) FROM public.ctf_user where id=2)—.

https://owasp.org/www-pdf-archive/Abhay_Boston_2017_World_Tour_Presentation.pdf

Microsoft PowerPoint - SQLinjectionNotOnly.ppt
1'))) UNION ALL SELECT NULL, Concatenated SQL query# AND ((('RaNd' LIKE 'RaNd. 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.

https://owasp.org/www-pdf-archive/SQLinjectionNotOnly.pdf

064-29: Creating Efficient SQL - Union Join without the Union Clause
select aNumCol from a UNION select aCharCol from b. Alot more subtle and, worse yet, platform specific is the issue of database performance. Since each member of a UNION clause is itself a fully formed, stand alone fullselect statement, database implementations execute each member...

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

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
A. UNION B. UNION ALL C. INTERSECT D. MINUS Answer: A. Set operators are used to combine the results of two ormore SELECT statements.Valid set 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

PowerPoint Presentation | third->next = NULL
prev = ptr prev->next = NULL. The bitwise XOR may be used to invert selected bits in a register (toggle) XOR as a short-cut to setting the value of a register to zero.

http://web.cse.ohio-state.edu/~reeves.92/CSE2421sp13/SlidesSp13Wk5.pdf

Microsoft Word - Blindfolded SQL Injection - Final.doc
Since performing a UNION SELECT statement requires knowledge of the number of fields in the query as well as the type of each field, it is often 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.

https://index-of.es/Hacking/SQL-Injection/Blindfolded_SQL_Injection.pdf

Querying Microsoft | Module 8: Querying Full-Text Indexes
Write SELECT queries to retrieve data. Group and summarize data using Transact-SQL. Join data from multiple tables. Module 3, “Retrieving Data,” covers the SELECT statement in detail, using many examples to demonstrate how to sort data, eliminate duplicates, and change the format of a result set.

http://index-of.es/Rdbms/MSSQL%20-%20Querying%20Microsoft%20SQL%20Server%202000%20with%20Transact-SQL.pdf