mysql - Site has been hacked via SQL Injection - Stack Overflow
5 янв. 2011 г. ... If you had SELECT * FROM users and users had 4 columns, the UNION must also have 4 columns. As a result, they just used `NULL values to populate ...
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SQL using If Not Null on a Concatenation - Stack Overflow
If I have the table … This will display Firstname-Middlename-Surname e.g. … The second one (Jane’s) displays correct, however since John doesn’t have a middlename, I want it to ignore the second dash.
SQL NULL Values - IS NULL and IS NOT NULL
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
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sql injection "union select null" - CodeProject
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...
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null - использование select null? - Qaru
Например: - IF EXISTS( select null from ...). Он устанавливает статус Exists как истинный, если в запросе выбора есть записи. Проверьте эту ссылку, которая содержит некоторые интересные комментарии об использовании select null с Exists: SQL SERVER- IF EXISTS (выберите null из...
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