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When using the Java 8 Optional class, there are two ways in which a value can be wrapped in an optional. String foobar ...

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

I’m having a problem where when I try to select the rows that have a NULL for a certain column, it returns an ...

I have a dataframe with ~300K rows and ~40 columns. I want to find out if any rows contain null values – and ...

I’ve been searching a lot but couldn’t find a solution. How do you deal with a DateTime that should be able to contain ...

I have a table with this layout: CREATE TABLE Favorites ( FavoriteId uuid NOT NULL PRIMARY KEY, UserId uuid NOT NULL, RecipeId uuid ...

In Java I’m trying to test for a null value, from a ResultSet, where the column is being cast to a primitive int ...

Could someone please explain the following behavior in SQL? SELECT * FROM MyTable WHERE MyColumn != NULL (0 Results) SELECT * FROM MyTable ...

How can I check if a value is null or empty with XSL? For example, if categoryName is empty? I’m using a when ...

How do I verify the existence of an object in JavaScript? The following works: if (!null) alert("GOT HERE"); But this throws an Error: ...