MySQL CONCAT returns NULL if any field contain NULL
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 …
sql - CONCAT'ing NULL fields - Stack Overflow
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 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.
postgresql - String concatenation with a null seems to... - Stack Overflow
In Postgres: … I was expecting it would otherwise return 'test'. Is this desired behavior? Seems weird that string concatenation with a null value would nullify the entire string... Referring to pg docs …
hindi all song UNION ALL SELECT NULL NULL NULL CONCAT...
Null Byte and using %60 union base Sql Injection.
Confusing SQL error in SELECT NULL, *, NULL, NULL - Stack Overflow
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.
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...
SQL is null and = null - Stack Overflow
What is the difference between … and … and why does the latter not work?
SQL NULL Values - IS NULL and IS NOT NULL
The IS NULL operator is used to test for empty values (NULL values). The following SQL lists all customers with a NULL value in the "Address" field: Example. SELECT CustomerName, ContactName, Address FROM Customers WHERE Address IS NULL
Заметка про NULL / Хабр
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами.