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Need to check is null or zero by column if something wrong doing some algorithm. This is a table: col1 col2 col3 col4 1 0 3376 0 2 600 null 14468.5714 3 null 0 0 4 600 3376 null. COALESCE doesn't work with zero "0" value, case its too huge. need to realize some of that.
Классический вариант внедрения SQL-кода, когда в уязвимый параметр передается выражение, начинающееся с «UNION ALL SELECT». Эта техника работает, когда веб-приложения напрямую возвращают результат вывода команды SELECT на страницу...
The null character (also null terminator or null byte), abbreviated NUL or NULL, is a control character with the value zero. It is present in many character sets, including ISO/IEC 646 (or ASCII)...
Note: A NULL value is different from a zero value or a field that contains spaces. A field with a NULL value is one that has been left
For a style value of NULL, NULL is returned. data_type determines the range. Return types.