select cast (2000 as type of quint) from rdb$database select cast (2000 as int) from rdb$database. If TYPE OF is used with a (VAR)CHAR type, its character.
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-999.9+union+all+select+%27R3DM0V3_hvj_injection',null%2CNULL%2CNULL%2CNULL%2CNULL%2CNULL
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.
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...
Эта техника работает, когда веб-приложения напрямую возвращают результат вывода команды SELECT на страницу: с использованием цикла for или похожим способом, так что каждая запись полученной из БД выборки последовательно выводится на страницу.
union all select null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,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 record or update a record without adding a value to this
When the CAST or CONVERT functions output a character string, and they receive a character string input, the output has the same collation and collation label as the input.