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Нашёл 8 млн ответов for 'Tafsir ibnue UNION ALL SELECT NULL-- SveV'.

Advanced_SQL_InjectionV2
Union-Based SQL Injection Syntax for extracting the USER. 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

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 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

SQL Injection
res = select CBalance from Balances where Acct=‘9999’ or ‘1’=‘1’. • Since ‘1’=‘1’ is always true, the select statement will return all records • res will contain, depending on the language. – every record – the first record – the last record.

https://www.cs.montana.edu/courses/csci476/topics/sql_injection.pdf

242-31: SQL Set Operators: So Handy Venn You Need Them
Set operators are so designated because they are conceptually derived from mathematical set theory. The three basic set operators are UNION, INTERSECT, and EXCEPT. All three, with variations (in particular, OUTER UNION) and options, are implemented in PROC SQL.

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

064-29: Creating Efficient SQL - Union Join without the Union Clause
SELECT col FROM a UNION SELECT col FROM b. data _null_; set a b; run; COL one two three six seven eight. The ambiguity whether to list table a or b first, before the UNION statement is a big hint that this query will perform sub-optimally at the database.

https://support.sas.com/resources/papers/proceedings/proceedings/sugi29/064-29.pdf

052-29: The Power of CALL SYMPUT - DATA Step Interface by...
/* (3) Assign the largest value of CON to the macro variable N. */ DATA _NULL_; Set unique end=last; if last then call symput('N', put(con, 3.)); run

https://support.sas.com/resources/papers/proceedings/proceedings/sugi29/052-29.pdf

ROOT Lecture 6 | histo = NULL
// Declaration of leaves types. TH1D*. histo = NULL

http://hadron.physics.fsu.edu/~skpark/document/ROOT/RootLecture/RootLecture290305.pdf

Null Session Enumeration from a
Null Session Enumeration from a Windows-Based System. The first step in enumerating CIFS/SMB is to connect to the 6. In addition, select the following settings 9. You can also view the output of the scan by clicking the View Reports button and selecting the various reports of interest (these reports...

https://www.utc.edu/center-academic-excellence-cyber-defense/pdfs/4660-lab4.pdf

SQL - unions clause
The SQL UNION clause/operator is used to combine the results of two or more SELECT statements without returning any duplicate rows. To use UNION, each SELECT must have the same number of columns selected, the same number of column expressions, the same data type...

http://www.tutorialspoint.com/sql/pdf/sql-unions-clause.pdf

Using the Set Operators | UNION ALL
Performance wise, UNION ALL shows better performance as compared to UNION because resources are not wasted in filtering duplicates and sorting the result set. Set operators can be the part of sub queries. Set operators can't be used in SELECT statements containing TABLE collection expressions.

https://www.tutorialspoint.com/sql_certificate/pdf/using_the_set_operators.pdf