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

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

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

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

Word Pro - DB2_UNION_ALL_final.PDF
union all select * from g3) select prod_id, prod_desc, city, channel, sum(revenue) as “Total Revenue” from sales2 group by prod_id, prod_desc The joins are now being performed below the unions. As before, each join has a smaller input set and is able to make use of indexes on the base tables.

https://www.ibm.com/developerworks/data/library/techarticle/0202zuzarte/0202zuzarte.pdf

Enterprise COBOL for z/OS V4.2 Language Reference
NULL, NULLS Represents a value used to indicate that data items defined with USAGE POINTER, USAGE PROCEDURE-POINTER, USAGE FUNCTION-POINTER, USAGE OBJECT REFERENCE, or the ADDRESS OF special register do not contain a valid address.

https://www.ibm.com/support/knowledgecenter/SS6SG3_4.2.0/com.ibm.entcobol.doc_4.2/PGandLR/igy3lr50.pdf

IBM Db2 12 for z/OS Performance Topics | 1.4 How to use this book
8.1 UNION ALL and OUTER JOIN performance enhancements. 8.1.1 Reorder OUTER JOIN tables to avoid materializations. The results for these random select/insert/delete test runs by using fast index traversal (comparing to the corresponding base runs with no fast index traversal) are listed in Table 2-2.

http://www.redbooks.ibm.com/redbooks/pdfs/sg248404.pdf