In these days where AI is writing more and more of our code, I believe we need to help keep our skills sharp, because we still need to get deep into our code and figure out innovative code. Especially as AI doesn't tend to write the most efficient SQL queries possible, especially when we're dealing with huge databases.
The best way I've found to keep up skills is to use MySQL in Linux for any database modifications. I've used phpMyAdmin and HeidiSQL in the past, and they can be very useful, but tackling everything through the MySQL prompt really keeps syntax fresh in your mind and even alerts you to possible issues.
When you spend a decent amount of time with the command prompt, navigating a database starts to feel a lot like using bash to navigate a file system in Linux. Commands like show tables; and show databases; aren't used often in code, but they start to become second nature on the command prompt.
Another value to this is when running SELECT on certain tables, you can really feel how long the load times are. It may make you realize it's time to add some new indexes to your table or even set up cron jobs to create new tables with more manageable data.