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Use union select null, null, null is the same. information_schema mysql greater than 5.0 of the library version of the database and stores all information mysql table structure, it is possible using information_schema library was quickly injected.
SQL-инъекции' union select null, null, null -- / Хабр
?id=1' union select null,null,table_name,null from information_schema.tables Это стало возможным благодаря добавлению таблицы information_schema в MySQL 5.0+ и по ее наличию также можно косвенно определить версию используемой БД.
mysql - Removing NULL value in SQL JOIN and UNION Operators in...
php mysqli database column cannot be null FIX - YouTube
sql injection "union select null" - CodeProject
Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. When you do a UNION query, both SELECT statements of the query must have the same number of columns.
How the SQL UNION Operator Deals with NULL Values
So three NULLs were reduced to just one NULL. This is the same as doing the following: Select null union distinct select null union distinct select null Here are examples that use data from a database.
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sql - How null values are treated in union/union all in... - Stack Overflow