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Нашёл 3 млн ответов for 'Tafsir ibnue UNION ALL SELECT NULL,NULL-- WpbP'.

4/4
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

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 version())--. Let’s fetch the current db user. current_user variables and the getpgusername() function: ▸ abcd' UNION ALL SELECT NULL,(SELECT user)

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

242-31: SQL Set Operators: So Handy Venn You Need Them
Now we’ll look at the UNION, which is the simplest form of the most widely used of the set operators. A set operator works on the results of two SELECTs. This is unlike a join, which is implemented The OUTER UNION operator preserves columns which do not align, and generates nulls (missing values)...

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

SQL - unions clause
To use UNION, each SELECT must have the same number of columns selected, the same number of column expressions, the same data type, and have them in the same order, but they do The UNION ALL operator is used to combine the results of two SELECT statements including duplicate rows.

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
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

Microsoft PowerPoint...
Comparisons Involving NULL and Three-Valued Logic. Meanings of NULL. Unknown value Unavailable or withheld value Not applicable attribute. Each individual NULL value considered to be different from every other NULL value SQL uses a three-valued logic: TRUE, FALSE, and UNKNOWN.

http://eecs.csuohio.edu/~sschung/cis430/Elmasri_6e_Ch05AddedAllSetDivision_Nov2016_2.pdf

Microsoft PowerPoint - Elmasri_6e_Ch05AddedAll.ppt
Comparisons Involving NULL and Three-Valued Logic. Meanings of NULL. Unknown value Unavailable or withheld value Not applicable attribute. Each individual NULL value considered to be different from every other NULL value SQL uses a three-valued logic: TRUE, FALSE, and UNKNOWN.

http://cis.csuohio.edu/~sschung/cis612/Elmasri_6e_Ch05AddedAll_0806.pdf