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Alt 24-11-2019, 12:21
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Hey, let me answer your last question first.
No, you don't, but you probably can learn the others pretty fast. SQL is standard essentially but all of the RDBMS have added some functionality where developers found this missing from the standard. So most of the simple queries are the same, but all have slight deviations and/or additions or maybe even have not fully implemented the standard.

Coming from JavaScript you can consider SQL a standard like HTML , CSS or JS, but looking at different browsers you find their individual differences as well.

Asking for JS in the context of Database I assume you are talking Serverside (like nodeJS) here?

The biggest difference to mongo when using SQL is that your data needs to be structured. You are working with tables (or potentially objects when talking about PostgreSQL) instead of documents.

PostgreSQL and MySQL are both good startingpoints.
Good programming is 40% experience, 20% skill, 20% RTFM, 15% caffeine, and 5% attention to detail.
When everything else fails, manipulate the data...
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