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999999.9 /**/union/**/all /**/select /**/cast...

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aLl sElEcT null null null null.

999999.9 /**/union/**/all /**/select /**/cast...

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sql union all data type error with nulls - Stack Overflow

stackoverflow.com

Then in the second table I have select ..., null as opt from... I know that I could have an empty string with '' as opt however, I don't want an empty string, I really do need it to be null.

Null character - Wikipedia

en.wikipedia.org

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)...

sql injection "union select null" - CodeProject | To display as

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...

php - A customers site had a big mysql injection attack on it, just want...

security.stackexchange.com

union all select null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null

OBIEE: Conversion Functions OBIEE | CAST

obieetutorialguide.blogspot.com

CAST(expr|NULL AS CHAR(n)). For example: CAST(companyname AS CHAR(35)). You can also use the following syntax

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).

How to retreive only columns which having at least one not null value...

social.msdn.microsoft.com

Union select null, null, null, null, null, null -- test all nulls --*/ ). A. DECLARE @ColumnDynamicSQL nvarchar(MAX)

SQL NULL Values - IS NULL and IS NOT NULL

www.w3schools.com

Note: A NULL value is different from a zero value or a field that contains spaces.

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