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Нашёл 13 млн ответов for 'college strategies UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL-- sZSj'.

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

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

Csg2
Key Type Null/ Unique Default Value. Data Type Length. Pk nn,u. The UNION SET Operator The UNION operator returns all rows selected by either query. Use the UNION operator to return all rows from multiple tables and eliminate any duplicate rows.

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

Showing only the Date with a DateTime field
Null null null null null null null null. Hint. You won’t be able to sort directly on the Region field here. When the Region contains a null, you will have a 1 in the final column. Now, just add the fields for the Order By clause, in the right order.

https://sqlpracticeproblems.com/wp-content/uploads/2018/06/SQLPracticeProblems_Sample.pdf

Egitim-Introduction to Oracle 9i SQL Student Guide Vol2.pdf
Group functions ignore null values. If you want to include null values, use the NVL function. The reason is that all conditions that compare a NULL value result in NULL. Whenever NULL values are likely to be part of the value set, do not use NOT IN as a substitute for NOT EXISTS.

http://bookish.synthasite.com/resources/Answer%20of%20exercises%20introduction%20to%20oracle.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.

https://www.cs.montana.edu/courses/csci476/topics/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. SELECT * FROM table UNION.

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

slide.dvi | select customer-name from customer
• The result of any arithmetic expression involving null is null. • Roughly speaking, all comparisons involving null return false. • Find all loan numbers which appear in the loan relation with null values for amount. select loan-number from loan where amount is null.

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

Using the Set Operators Questions
B. It returns duplicate values ignoring NULL values C. It returns duplicate values including NULL values D. It eliminates duplicate values and does not ignore A. It throws an error as TO_CHAR NULL cannot be used B. It executes successfully and gives the values for employees' id, first_name and current job.

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