SQLServerCentral Editorial

Deceptive Visualizations

I'm sure there are plenty of examples, but I've seen deceptive data visualizations far too often in mass media. I don't often watch the news, but at times I've been at the gym, saw a graph on a television, and been a little surprised. The issue that bothered me is similar to what's discussed in […]

SQLServerCentral Article

Conditional DELETE and INSERT in PostgreSQL

Introduction We are comfortable with inserting/deleting record(s) into/from a table. But we sometimes get confused when we need to insert or delete records conditionally from a table. Let us look at an example. Example scenario Suppose we have a table, called ALL_EMPLOYEES, which contains all employees' information who are working or had ever worked for […]

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Question of the Day

The Density Vector

When building statistics, there is the concept of density that refers to the duplicates in a table. How is this calculated?

See possible answers