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Нашёл 9 млн ответов for 'college strategies UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL-- ZhBt'.

064-29: Creating Efficient SQL - Union Join without the Union Clause
data _null_; merge a b; by key; run; KEY ACOL BCOL p one six q two seven r three eight. The row-wise join returns a single column 'col' instead with a result set containing all the rows of both constituent tables a and b, regardless of the values of each table's 'key' column. SELECT col FROM a UNION...

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

slide.dvi | select customer-name from customer
Above statement ignores null amounts; result is null if there is. & no non-null amount. • All aggregate operations except count(*) ignore tuples with null values on the aggregated customer-name. Jones Smith null Hayes. • Find all customers who have either an account or a loan (but not both) at the bank.

https://cs.nyu.edu/courses/spring01/G22.2433-001/mod4.2.pdf

SQL Injection
1234' and account=NULL; -- For mysql, there must be white space after --. You are identified as name userid. – We know account is a valid field name, because. 1234' or 1=1 union select null from balances; -- The used SELECT statements have a different number of columns. Introduction.

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

Rela7onal Model (Chapter 2) | Null value
Careful with NULLs: select name from instructor where salary < 100000 or salary >= 100000; Wouldn’t return the instructor with NULL salary (if any). Suppose a tuple occurs m times in r and n times in s, then, it occurs: ● m + n times in r union all s ● min(m,n) times in r intersect all s ● max(0, m – n) times...

https://www.cs.umd.edu/class/fall2015/cmsc424/lecture-relational.pdf

Instructor: Amol Deshpande
◦ Nulls ◦ Updates ◦ Views ◦ Integrity Constraints ◦ Transac8ons ◦ Triggers. } Provide a mechanism to hide certain data from the view of certain users. create view all-customers as (select branch-name, customer-name from depositor, account where depositor.account-number = account.account-number)...

https://www.cs.umd.edu/class/fall2012/cmsc424/lecture-more-sql.pdf

Chapter 3 Pointer Subterfuge
l One can use NULL byte attack. %00’ UNION SELECT password FROM tblUsers WHERE username=‘admin’--. URL Encoding for NULL. NULL byte can terminate strings and hence the remaining may Not be filtered May work in Managed Code Context.

https://index-of.es/Attacks/SQL%20injection%20attacks/Lecture8.pdf

Microsoft Word - Blindfolded SQL Injection - Final.doc
Injecting 11223344) UNION SELECT NULL,NULL,NULL,NULL WHERE 1=2 --, results in the following query Once the NULL-based UNION statement works, it is a trivial process to identify the types of each column. In each iteration a single field is tested for its type.

https://index-of.es/Hacking/SQL-Injection/Blindfolded_SQL_Injection.pdf

Csg2
2-12 Using the NULL Conditions 2-14 Logical Conditions 2-15 Using the AND Operator 2-16 Using the OR Operator 2-17 Using the NOT Operator 2-18 You can add data through a view unless it contains any of the items listed in the slide or ther e are NOT NULL columns, without default values, in the...

https://index-of.es/Rdbms/Oracle9i%20SQL-Slide%20&%20Guide-II.pdf

CS 193A
index 0 1 2 value null null null. Null pointer exception. ● dereference: To access data or methods of an object with the dot notation, such as s.length(). – It is illegal to dereference null (causes an exception). – null is not any object, so it has no methods or data.

https://www.cs.utexas.edu/users/witchel/371M/lectures/01-java-review.pdf

iqapgv2.book
For the purpose of grouping, all NULL values are considered to be in the same group, even though NULL values are not equal to one another. The HAVING clause acts as a filter, much like the WHERE clause, on the results of the GROUP BY clause. Consider the semantics of a simple query...

http://infocenter.sybase.com/help/topic/com.sybase.infocenter.dc00800.1510/pdf/iqapgv2.pdf