VoltDB on Windows 10@Docker

VoltDB on Windows 10@Docker
If you look for a truly in-memory open source database then VoltDB might be the only choice available at the moment. Unfortunately, for me, there are no binaries for Windows available as big part of the code was written in C/C++ which is hard to port from Linux to Windows. But there is a way ...

No Duplicates in Subset

Yesterday I was helping a friend of mine with an interesting problem. There is a big table ~4MLN rows, it is wide (has many columns, lets say 30). We are interested in getting rows, which contain duplicates in 5 columns, we do not care what data are in other columns, at least not with regard ...