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

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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

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
§ Distinguishing between null and zero. The null pointer and an integer 0 cannot be distin-guished well for overload resolution. Further, programmers have often requested that the null pointer constant have a name (rather than just 0). This is one reason why the macro...

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

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

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

Application Notes: AN_SY8208A
(VIN=12V, VOUT=5V, ILMT floating, Null Load to Short). Output capacitor COUT: The output capacitor is selected to handle the output ripple noise requirements. Both steady state ripple and transient requirements must be taken into consideration when selecting...

https://reservice.pro/upload/Datasheets/190211/Y8208.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. SELECT * FROM table UNION.

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

Inserting NULL values into a table and Selecting NULL values
select * from Employee1; -- Employee1 table does NOT have FK constraint superssn to PK ssn, so any value including NULL or ' ' will be accepted but NULL is taken as missing value 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