... select 1 //from(//select count(),//concat((//select(//select //unhex(//hex(//**/union/**/all/**/select/**/null,null,null,null--/**/cqwp/concat(0x217e21 ...
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.
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 column_names FROM table_name WHERE column_name IS NOT NULL
SELECT CONCAT("SQL ", "Tutorial ", "is ", "fun!") AS ConcatenatedString; Try it Yourself ». Definition and Usage. The CONCAT() function adds two or more expressions together. Note: Also look at the CONCAT_WS() function. Syntax.
CONCAT() returns NULL if any argument is NULL.
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like we see [select] is down let's double text [Replacing keywords] like this SeLselectECT.
Первая из них – CONCAT – возвращает NULL, если среди аргументов функции встречается NULL, вторая – CONCAT_WS – опускает аргумент, если его значение NULL. Кроме того, эта функция первым аргументом имеет разделитель, используемый при конкатенации.