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Нашёл 4 млн ответов for 'college strategies UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL-- rheU'.

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

Word Pro - DB2_UNION_ALL_final.PDF
sales( sales_date date not null, prod_id integer, city_id integer, channel_id integer, revenue decimal(20,2)). Page 2 of 25. The optimization level setting within DB2 is a vehicle that allows the user to control the various query transformations and optimization strategies used in the DB2 compiler.

https://www.ibm.com/developerworks/data/library/techarticle/0202zuzarte/0202zuzarte.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

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

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

CS61 Section Notes (with solutions)
counter++; return NULL; } # Run the program over and over $ sh test.sh OK counter=4000000 BOOM! counter=3490653 BOOM! counter=3471683 BOOM! counter=3404617 ... The exciting answer: You have no idea what will be printed out.

https://cs61.seas.harvard.edu/wiki/images/f/fd/Section9NotesWithSolutions.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
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. All three types (number, integer, string) are tested for the field, one of them should work. This way, it takes up to three times the number of...

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

Csg2
Key Type Null/ Unique Default Value. Data Type Length. The UNION SET Operator The UNION operator returns all rows selected by either query. UNION operates over all of the columns being selected. • NULL values are not ignored during duplicate checking. •

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

Microsatellite null alleles in
Null alleles can also be generated via differential amplication of size-variant alleles (Wattier et al, 1998). Due to the competitive nature of PCR, alleles of short length often amplify more efciently than larger ones, such that only the smaller of two alleles might be detected from a heterozygous individual.

https://faculty.sites.uci.edu/johncavise/files/2011/03/255-dakinnullalleles.pdf