HackerRank isn’t just a random collection of problems; they’ve organized their SQL section pretty well. You can find challenges that cover everything from basic SELECT statements to more involved ...

Task 4: Aggregate Functions and Grouping – SQL Developer Internship Objective This task demonstrates the use of aggregate functions and grouping to summarize and analyze hospital data from the ...

I realized how much easier my life would be if SQL had a mode() aggregate function. (I'm using it in the mathematical sense). I'm guessing that either I use SQL in a wierd way or there is a good ...