Comment Comment by magicalhippo I learned SQL on a need to know basis. For me, recursive queries were the ones that needed the most time to click.Another one that caught me by surprise was NULL vs unknown[1]. That bit me in a couple of queries.[1]: https://learnsql.com/blog/understanding-use-null-sql/ parent magicalhippo 5 years ago
Another one that caught me by surprise was NULL vs unknown[1]. That bit me in a couple of queries.
[1]: https://learnsql.com/blog/understanding-use-null-sql/