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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...
The Background I was trying to solve the fourth realistic mission in hackthissite.org, and couldn't figure out exactly what SQL I should inject into the URL to retrieve the list of emails.
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
Ошибка сайта в данном случае. Но вообще это устройство для безвозвратного слива данных. Типа черной дыры - туда можно кинуть все что угодно и сколько угодно но обратно не вернуть никогда.
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NULL в Системах управления базами данных (СУБД) — специальное значение (псевдозначение), которое может быть записано в поле таблицы базы данных (БД). NULL соответствует понятию «пустое поле», то есть «поле, не содержащее никакого значения».
COL1 COL2 COL3 1 a1 NULL NULL 2 b1 NULL x3 3 c1 NULL y3 4 NULL d2 z3 5 NULL a2 NULL 6 NULL c2 NULL 7 NULL b2 NULL. I want to get output like this: (i.e. All null values have to be eliminated from the all the columns).
A NULL pointer is a specific value assigned to a pointer, just like any other value. NULL is a language-specific designation, and is guaranteed to be
In this video, I have explained about the NULL and NOT NULL values to find in the columns.
Null may refer to: Null (SQL) (or NULL), a special marker and keyword in SQL indicating that something has no value. Null character, the zero-valued ASCII character, also designated by NUL, often used as a terminator, separator or filler. This symbol has no visual representation.