To query a user's mobile phone and WeChat number, the following SQL statement can be used.

HackerRank isn’t just a random collection of problems; they’ve organized their SQL section pretty well. You can find ...

Abstract: In modern cities, more and more people drive the vehicles, equipped with the GPS devices, which create a large scale of trajectories. Gathering and analyzing these large-scale trajectory ...

What if mastering a handful of Excel functions could save you hours each week, eliminate frustrating errors, and even make you the go-to problem solver in your office? It’s not just a bold claim—it’s ...

While the PIVOTBY function can only reference source data in Excel, if you create a PivotTable in Excel 2016 or later or Excel for Microsoft 365, you can choose to pull in data from an external source ...

If you are looking to improve your financial modelling skills when using Microsoft Excel spreadsheets you might be interested in this quick overview guide that provides an in-depth exploration of the ...