One of the trickiest aspects of relational database management can be dealing with missing information. The standard method of representing missing information is to set the “value” to null. A null ...

Unix systems make it easy to make output that you don’t want to see simply disappear. Toss output into the void. Send errors in one direction, useful output in another. Something of a bit bucket, ...

When databases are designed, they serve as semantic expressions of the organizations that employ them. Those expressions describe the data items of importance and articulate the business rules as the ...

I'm looking at a time series that has null data points. The data series is class enrollment by quarter and there are quarters when certain classes aren't offered. Is imputing the data the way to go ...

Have you ever stared at a massive dataset, only to realize it’s riddled with empty columns that serve no purpose? It’s a frustrating scenario—one that wastes time, clutters your workflow, and makes ...

You can define data fields to not store null data by specifying the NU option in data definition statements. In normal data storage (that is, NU not specified), a null value is represented by two ...