As shown below, I need not null values to be at the start of all output fields.
I have a table with three fields, FirstName, LastName and Email. Here's some dummy data: … Now, if I do: … Vitals for Joe is null, as there is a single null field. How do you overcome this behaviour?
I have following data in my table "devices" … I executed below query … It returns result given below … How to come out of this so that it should ignore NULL AND result should be …
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cannot be null.
Is there an option to make MySQL's Group_Concat function include nulls? Consider the following example from my source table: … When I query on the selection table with GROUP_CONCAT...
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.
What is the difference between … and … and why does the latter not work?
Union select null, null, null, null, null, null, null from information_schema.tables.
Note: A NULL value is different from a zero value or a field that contains spaces.
Используйте NULL в UNION-инъекциях вместо попыток угадать строку, дату, число и прочее. Но будьте аккуратны при слепой инъекции, т.к. вы можете спутать ошибку БД и самого приложения. Некоторые языки, например ASP.NET, выдают ошибку при использовании значения NULL (т.к...