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Нашёл 8 млн ответов for 'textbook advertising UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL-- xUly'.

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

1'))) UNION ALL SELECT NULL, Concatenated SQL query# AND...
ORDER BY clause brute-forcing NULL brute-forcing Sequential number brute-forcing. The number of columns in the SELECT statement is fewer than For a UNION query SQL injection exploit: SELECT name, surname FROM users WHERE name='foobar\' UNION ALL SELECT NAME, PASSWORD...

https://owasp.org/www-pdf-archive/SQLinjectionNotOnly.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 i: Database Performance and Query Optimization
For example, NULL values and default values that can influence the statistical values are not taken into account. Metadata information Includes the total number of rows in the table, indexes that exist over the table, and which indexes are useful for implementing the particular query.

https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_71/rzajq/rzajq.pdf

DB2 9 for z/OS Technical Overview
6.4.3 Selecting values as you delete: SELECT FROM DELETE. 6.5 ORDER BY and FETCH FIRST in subselect. 145 6-4 Example of UNION, EXCEPT, and INTERSECT on result tables R1 and R2 . ... . .

http://www.redbooks.ibm.com/redbooks/pdfs/sg247330.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

Introduction to the OWASP Mutillidae II Web Pen-Test Training...
By forced redirection, browser “hooking”, or social engineering a user can be forced to visit the capture-data.php page. The user’s cookies, all request parameters (GET and POST), client IP address and user-agent string will automatically be parsed into a database table18 and written to a text file19.

https://www.sans.org/reading-room/whitepapers/testing/introduction-owasp-mutillidae-ii-web-pen-test-training-environment-34380

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8.18.1 The range and null space of a matrix. 8.18.2 N simultaneous linear equations in N unknowns. The third edition of this highly acclaimed undergraduate textbook is suitable for teaching all the mathematics ever likely to be needed for an undergraduate course in any of the physical sciences.

http://luiarthur.github.io/assets/ams211/mathbook.pdf