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Нашёл 4 млн ответов for 'textbook advertising UNION ALL SELECT NULL,NULL-- IHDy'.

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UNION ALL SELECT NULL, *, NULL, NULL FROM email ... Use of an unqualified * with other items in the select list may produce a parse error. ... select NULL, email.*, NULL, NULL from email ... the tables when only using one table and selecting literals in addition to all the columns on that single...

https://www.docdroid.net/file/download/y6aFEhT/1589610482388-pdf.pdf

Microsoft Word - Lecture22.doc
Null is often status quo, a specific value. For two proportions or two means, null is usually “no difference.” The “equal sign” always goes in the null hypothesis. Alternative hypothesis is one of these, based on context: Ha: p ≠ p0 (a two-sided hypothesis) Ha: p > p0 (a one-sided hypothesis) Ha...

https://www.ics.uci.edu/~jutts/8/Lecture22Compact.pdf

242-31: SQL Set Operators: So Handy Venn You Need Them
Set operators are so designated because they are conceptually derived from mathematical set theory. The three basic set operators are UNION, INTERSECT, and EXCEPT. All three, with variations (in particular, OUTER UNION) and options, are implemented in PROC SQL.

https://support.sas.com/resources/papers/proceedings/proceedings/sugi31/242-31.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

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

Go Secure Coding Practices
select * from data where id=-1 union select null,null,database()

https://owasp.org/www-pdf-archive/Owasp-171123063052.pdf

Java Security.key | ‘; "select * from employees where last_name = '';'"
Type: UNION query Title: MySQL UNION query (NULL) - 6 columns Payload: name=Baaz' UNION ALL SELECT NULL,NULL,NULL,NULL,CONCAT INFORMATION_SCHEMA.CHARACTER_SETS GROUP BY x)a) AND 'hxTg'='hxTg. Type: UNION query Title: MySQL UNION query (NULL) - 6...

https://s3.amazonaws.com/cmj-presentations/hacking-rwx-2017/Hacking_and_Hardening_Java_Web_Applications.pdf