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Нашёл 12 млн ответов for 'textbook advertising UNION ALL SELECT NULL-- kEOP'.

064-29: Creating Efficient SQL - Union Join without the Union...
SELECT col FROM a UNION SELECT col FROM b. data _null_; set a b; run; COL one two three six seven eight. The ambiguity whether to list table a or b first, before the UNION statement is a big hint that this query will perform sub-optimally at the database.

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...

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: B. UNION ALL Returns the combined rows from two queries without sorting or removing duplicates. sql_certificate 3.Which SET operator does the following figure indicate?

https://www.tutorialspoint.com/sql_certificate/pdf/using_the_set_operators_questions.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 considered that it cannot be performed without detailed error messages, especially when the number of fields in the original query is large.

https://www.imperva.com/docs/IMPERVA_HII_blind-sql-injection-attacks.pdf

Chapter 1 INTRODUCTION.
NULL Value Test Operator: IS NULL. Logical Operators: AND, OR and NOT. Linked SELECT statements: The correlated subquery. Does the subquery retrieve values: The EXISTS operator. Combining multiple queries: The UNION clause.

https://my.uopeople.edu/pluginfile.php/57436/mod_book/chapter/37615/CS2203.Textbook.SQL.A.Practical.Intro.pdf

Advanced_SQL_InjectionV2
Union-Based SQL Injection Syntax for extracting the USER. 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

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

From SQL injection to shell
SELECT * FROM articles WHERE id=3 UNION SELECT ... Since it is used to retrieve information from other tables, it can be used as a SQL injection payload. The beginning of the query can't be modify directly by the attacker since it's generated by the PHP code.

http://index-of.co.uk/Webshell/from_sqli_to_shell.pdf

Chapter 1. Oracle SQL TuningPocket Reference
The SELECT statement looks at all three indexed columns. Many people believe that Oracle will merge the two indexes, which involve those three columns, to return the requested data. In fact, only the two-column index is used; the...

http://index-of.co.uk/OReilly/Oracle.SQL%20Tuning%20Pocket%20Reference.pdf