Top "Null" questions

What is the PostgreSQL equivalent for ISNULL()

In MS SQL-Server, I can do: SELECT ISNULL(Field,'Empty') from Table But in PostgreSQL I get a syntax error. …

sql-server postgresql null

Checking for a null int value from a Java ResultSet

In Java I'm trying to test for a null value, from a ResultSet, where the column is being cast to …

java null resultset

Undefined or null for AngularJS

When I write watch handling functions I check newVal param on undefined and null. Why does AngularJS have such a …

angularjs null undefined

Is null check needed before calling instanceof?

Will null instanceof SomeClass return false or throw a NullPointerException?

java nullpointerexception null

SQL query, if value is null then return 1

I have a query that is returning the exchange rate value set up in our system. Not every order will …

tsql null ssms

Null check in VB

All I want to do is check if an object is null, but no matter what I do, if it …

vb.net null runtime-error

Best way to check for "empty or null value"

What is best way to check if value is null or empty string in Postgres sql statements? Value can be …

sql database postgresql null coalesce

How to set enum to null

I have an enum string name; public enum Color { Red, Green, Yellow } How to set it to NULL on load. …

c# enums null nullable

PHP json_decode() returns NULL with valid JSON?

I have this JSON object stored on a plain text file: { "MySQL": { "Server": "(server)", "Username": "(user)", "Password": "(pwd)", "DatabaseName": "(dbname)" }, "…

php json null

Filter values only if not null using lambda in Java8

I have a list of objects say car. I want to filter this list based on some parameter using Java 8. …

java lambda nullpointerexception null java-8