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Нашёл 4 млн ответов for 'college strategies UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL-- Imlx'.

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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

CS 232A: Database System
cannot be null (notice, it would make no sense to have an enrollment tuple without a student involved). – In the table corresponding to Em add a (non-required, i.e., potentially NULL) foreign key attribute referencing the ID of the table corresponding to Eo.

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). – In the table corresponding to Em add a (non-required, i.e., potentially NULL) foreign key attribute referencing the ID of the table corresponding to Eo.

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

Nulls Make Things Easier?
NULL represents unknown, not applicable, or unassigned. It has no data type, so comparing it to xed values always returns NULL. 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
§ OCLVoid includes the null value (and therefore all supertypes of OCLVoid). Union of set and set2 Intersection of set and set2 Difference set; elements of set, which do not § Select and Reject return subsets of collections – Iterate over the complete collection and...

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

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

Microsoft Word - Blindfolded SQL Injection - Final.doc
This type of NULL injection serves two purposes. The main purpose is to get a working UNION statement that has no errors. Although this UNION still does not retrieve any real data, it provides an indication that the statement indeed works.

http://injection.rulezz.ru/Blindfolded_SQL_Injection.pdf

SQL Injection in Oracle Webapps
SELECT firstname, lastname FROM customers UNION SELECT username, null FROM ALL_USERS ORDER BY 1,2. The most common techniques are the usage of "ORDER BY" or adding NULL values to the second query.

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