Different Databases

What’s the difference between all the different SQL databases like PostgreSQL and MySQL? I tried googling it but google didn’t give me a clear answer.

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There’s a lot of differences (besides names).
PostgreSQL was released in 1996 while MySQL was released in 1995.
PostgreSQL is a successor of Ingres, while MySQL is kind of it’s own thing.
Here on Replit, to use PostgreSQL you have to pay Cycles, while MySQL can be hooked up without them.
They have different creators, different applications, etc.

Then we have my favourite that is NoSQL like mongodb, which you can use for free (with limitation of course) via Atlas or fully free with your own server installation.