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Нашёл 16 млн ответов for 'college strategies UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL-- XuYR'.

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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...

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

A name for the null pointer: nullptr (revision
A null pointer constant is an integral constant expression (expr.const) rvalue of integer type that evaluates to zero. Two null pointer values of the same type shall compare equal. The conversion of a null pointer constant to a pointer to cv-qualified type is a single conver-sion, and not the sequence of...

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf

Nulls Make Things Easier?
SELECT NULL < NULL + 1; ?column? -(null). NULL represents unknown, not applicable, or unassigned. It has no data type, so comparing it to xed values always returns s. WITH ordertest AS ( SELECT NULL UNION ALL SELECT 2 UNION ALL SELECT 1 UNION ALL SELECT NULL.

https://momjian.us/main/writings/pgsql/nulls.pdf

Microsoft PowerPoint - PresentationCabot.pptx
§ Examples. null:OCLVoid ada.discount=null : Boolean branch42.address=null Union of set and set2 Intersection of set and set2 Difference set; elements of set, which do § Select and Reject return subsets of collections – Iterate over the complete collection and...

http://www.sti.uniurb.it/events/sfm12mde/slides/cabot.pdf

SQL Injection in Oracle Webapps
SELECT null,null,null,null FROM DUAL è Number of Columns = 4. Red-Database-Security GmbH. (3rd attempt). or 1=SYS.DBMS_AW_XML.READAWMETADATA((select banner from v $version where rownum=1),null)

http://www.red-database-security.com/wp/oracle_sql_injection_2009.pdf

CS 232A: Database System
cannot be null (notice, it would make no sense to have an enrollment tuple without a student involved). ( SELECT e.student FROM enrollment e WHERE e.class=1 ). UNION ALL ( SELECT s.id AS – All comparisons involving NULL are false by definition – All aggregation operations, except...

http://db.ucsd.edu/CSE232S18/handouts/Introduction.pdf

CS 232A: Database System
cannot be null (notice, it would make no sense to have an enrollment tuple without a student involved). ( SELECT e.student FROM enrollment e WHERE e.class=1 ). UNION ALL ( SELECT s.id AS – All comparisons involving NULL are false by definition – All aggregation operations, except...

http://db.ucsd.edu/static/CSE232S18/handouts/Introduction.pdf

Copyright © 201 9 by Academic Publishing
The results from the authors’ assessment of the null hypothesis based on Pearson's chi-squared test (Table 2 and Table 4) are quite satisfactory and confirm the advisability of taking the approach adopted by the authors. Out of 12 assessments of the null hypothesis only two confirmed the absence of a...

http://ejournal1.com/journals_n/1569926565.pdf

Microsoft Word - Inserting NULL values into a table and...
select * from Employee1; -- Employee1 table does NOT have FK constraint superssn to PK ssn, so any value including NULL or ' ' will be accepted but So space ' ' will be inserted but this is not taken as NULL by server, so IS NULL query would not select those tuple !

http://cis.csuohio.edu/~sschung/cis430/HandlingNULLvalues.pdf