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cannot be null.
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 - CONCAT'ing NULL fields - Stack Overflow | Post as a guest
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?
SQL is null and = null - Stack Overflow
What is the difference between … and … and why does the latter not work?
sql injection "union select null" - CodeProject | To display as
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...
9240 union all select null, null, null, null, concat...
-9240 UNION ALL SELECT NULL,NULL,NULL,NULL,CONCAT(0x717a716b71,0x5545577754584c4278524e46714441554748637367766d47526c6470446562764271454348557674,0x7176787a71)-- juXq.
Шпаргалка по SQL инъекциям | DefconRU
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...
SQL Injection Cheat Sheet | Netsparker
SELECT header, txt FROM news UNION ALL SELECT name, pass FROM members This will combine results from both news table and members table and return all of them. Another Example: ' UNION SELECT 1, 'anotheruser', 'doesnt matter', 1--. UNION – Fixing Language Issues.
SQL NULL Values - IS NULL and IS NOT NULL
Note: A NULL value is different from a zero value or a field that contains spaces.
Заметка про NULL / Хабр
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами.