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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...
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.
However, this will return NULL provider results as well, how would I exclude all null results?
The IS NOT NULL operator is used to test for non-empty values (NOT NULL values). The following SQL lists all customers with a value in the "Address" field: Example. SELECT CustomerName, ContactName, Address FROM Customers WHERE Address IS NOT NULL
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.
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).
In general, every NULL value is taken into account to vary from each alternative NULL in the database.
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select NULL customer, 'MOLOKO' product, 2 qty from dual union all --. Иван купил 2 молока.
/dev/null — специальный файл в Unix-подобных операционных системах. «NUL» — название символа из кодировки ASCII, имеющего код 0 и используемого для обозначения конца строк.