HelloSQL: Learn & Practice SQL — ASO

By Ryota Kumagawa on AppTrack Ninja.

Beginner-friendly query drills

SQL tends to make sense while you're reading about it, then fall apart the moment you try to write it yourself. HelloSQL is for the writing part. You read a problem, write a query, and run it. The results show up as a table, and if they're right, it's marked correct right away. Grading looks at what your query returns, not how it's written, so your query doesn't have to match ours. There are 120 exercises, and most of them look like everyday reporting tasks. For example: "List payments from largest to smallest. If two amounts are the same, put the older one first." The practice data is built …

Categories: Education, Developer Tools

Keyword visibility, ranked search terms and daily position movement for HelloSQL: Learn & Practice SQL.