For some data.table users, “dot-SD” is a bit of a mystery. But data.table creator Matt Dowle told me that it’s actually quite simple: Just think of it as a symbol representing “each group.” Let’s go ...

In the June issue of SQL Server magazine, item #4, they suggest that you don't need to use a dataset to fill a data table from a SQL query. Of course, it doesn't say how it is done. How do I get a ...