Relational databases. I honestly go for document and key-value stores often not because I think RDBs are ill suited for the job but because I don't want to deal with them.
I too have finally reached the same conclusion! Over the next few days, I'll be moving on from MySQL to MongoDB.
Same! I'm awful at SQL and RDBs are the bane of my existence
aaaaah, you break my heart :P
It's not lack of will, it's lack of competence :p
What concepts you find hard? Maybe I can help.
In the meantime I think you can start here:
I'm not saying relational DBs are super easy, but I think they are really important to know, even if you end up not using them :D
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