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sql injection "union select null" - CodeProject

www.codeproject.com

Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. this instruction is used in sql injection I tried it and it worked but I didn't really know how it works can somebody help me...

mysql - Exclude null results on a UNION query - Stack Overflow

stackoverflow.com

However, this will return NULL provider results as well, how would I exclude all null results?

sql - Union to handle NULL values - Stack Overflow

stackoverflow.com

select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f from table3.

Использование значения NULL в условиях поиска | Интерактивный...

www.sql-tutorial.ru

Предикат IS NULL позволяет проверить отсутствие (наличие) значения в полях таблицы. Использование в этих случаях обычных предикатов сравнения может привести к неверным результатам, так как сравнение со значением NULL дает результат UNKNOWN (неизвестно).

SQL NULL Values - IS NULL and IS NOT NULL

www.w3schools.com

A field with a NULL value is a field with no value. If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this

bkhh\') union all select null, null, null, null, null-- wesg, bkhh\') union...

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Spatu union all select null null null null—— oevz

attfreya.ru

Spatu union all select null null null null-- oevz.

ignore null valued in union | All replies

social.msdn.microsoft.com

I do not want to show revords with null values in any column i only want to only records with data in all column. How can i set that. Please help.

Заметка про NULL / Хабр | select col from ttt where col is not null

habr.com

IS NULL вернёт истину, если операнд имеет значение NULL и ложь, если он им не является.

SQL IS NULL | IS NOT NULL: Handling NULL In SQL Correctly

www.sqltutorial.org

NULL is special in SQL. NULL indicates that the data is unknown, inapplicable or even does not exist. In other words, NULL represents that the data is missing in the database. For example, if an employee does not have any phone number, you can store it as an empty string.

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