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I am getting NULL values in the results of an operation in MySQL. Is there a way to convert the NULL values into the value 0?
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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...
999999.9 union all select cast0x393133353134353632312e39 as char and 0=0. Relevance Best Sellers Price: Low to High Price: High to Low Top Rated
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
And the literal NULL would default to an int if you don't cast it as something else. So, for example, if you have a column where one of the UNIONed queries has a varchar and another of the queries has a NULL, the resulting column will be an int, because int has a higher precedence than varchar.
SELECT 'The list price is ' + CAST(ListPrice AS varchar(12)) AS ListPrice FROM dbo.DimProduct WHERE ListPrice BETWEEN 350.00 AND 400.00
NULL в Системах управления базами данных (СУБД) — специальное значение (псевдозначение), ��от��рое может быть записано в поле таблицы базы данных (БД). NULL соответствует понятию «пустое поле», то есть «поле, не содержащее никакого значения».
The null character (also null terminator or null byte) is a control character with the value zero. It is present in many character sets, including ISO/IEC 646 (or ASCII), the C0 control code, the Universal Coded Character Set (or Unicode), and EBCDIC.