Нашёл 4 млн ответов for 'textbook advertising UNION ALL SELECT NULL,NULL,NULL,NULL-- BLlq'.

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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...

Microsoft Word - Lecture22.doc
Null is often status quo, a specific value. For two proportions or two means, null is usually “no difference.” Rationale: Compare observed to expected if null is true If p0 really is the true population proportion, where does the observed value of pˆ fall in the sampling distribution of possibilities?

https://www.ics.uci.edu/~jutts/8/Lecture22Compact.pdf

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.

Go Secure Coding Practices
select * from data where id=-1 union select null,null,database()

https://owasp.org/www-pdf-archive/Owasp-171123063052.pdf

ACKNOWLEDGEMENTS
Two null hypotheses were also posed. 1.3 NULL HYPOTHESES. The purpose of this study is to demonstrate that the FCB grid can be used by students to write advertising strategy and that strategies written according to the FCB grid will be superior to those written according to the Bendinger formula.

http://uir.unisa.ac.za/bitstream/handle/10500/17867/thesis_yssel_jc.pdf?sequence=1

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 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

Using the Set Operators | UNION ALL
When multiple SELECT queries are joined using UNION operator, Oracle displays the combined result from all the compounded SELECT queries,after removing all duplicates and in sorted order ascendingbydefault, without ignoring the NULL values.

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

Microsoft Word - Blindfolded SQL Injection - Final.doc
This type of NULL injection serves two purposes. The main purpose is to get a working UNION statement that has no errors. Although this UNION still does not retrieve any real data, it provides an indication that the statement indeed works. Another purpose of this empty UNION is to get a 100...

https://www.imperva.com/docs/IMPERVA_HII_blind-sql-injection-attacks.pdf

Introduction to the OWASP Mutillidae II Web Pen-Test Training...
By forced redirection, browser “hooking”, or social engineering a user can be forced to visit the capture-data.php page. The user’s cookies, all request parameters (GET and POST), client IP address and user-agent string will automatically be parsed into a database table18 and written to a text file19.