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

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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...

https://www.docdroid.net/file/download/y6aFEhT/1589610482388-pdf.pdf

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 union all select * from g3) select prod_id, prod_desc, city, channel, sum(revenue) as The joins are now being performed below the unions. As before, each join has a smaller input set and...

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

IBM i: Database Performance and Query Optimization
For example, NULL values and default values that can influence the statistical values are not taken into account. Metadata information Includes the total number of rows in the table, indexes that exist over the table, and which indexes are useful for implementing the particular query.

https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_71/rzajq/rzajq.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
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

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

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

Inserting NULL values into a table and Selecting NULL values
select * from Employee1; -- Employee1 table does NOT have FK constraint superssn to PK ssn, so any value including NULL or ' ' will be accepted but NULL is taken as missing Insert Into Employee1 Values ('James', 'X', 'Brog1', '888660001','10-Nov-27','450 Stone, Houston, TX', 'M','55000', Null,'1')

http://cis.csuohio.edu/~sschung/cis430/HandlingNULLvalues.pdf