How the SQL UNION Operator Deals with NULL Values

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Mysql – How null is treated using union and union all in thesql...

As null null then how the value null is treated here and in which datatype it is considered. UNION removes duplicate records (where all columns in the results are the same), UNION ALL does not.

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SQL-инъекции' union select null, null, null -- / Хабр

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11223344) UNION SELECT NULL,NULL,NULL,NULL WHERE 1=2 –- Если нет ошибки, значит синтаксис верный, т.е. используется MS SQL Server. 11223344) UNION SELECT 1,2,NULL,NULL WHERE 1=2 – Если появилась ошибка, значит второй стоблец не является числом.

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Объединение UNION и UNION ALL в SQL – описание и примеры

sql - How null values are treated in union/union all in... - Stack Overflow

sql injection "union select null" - CodeProject