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Databases and their real world use examples
(lemmy.world)
This is a most excellent place for technology news and articles.
I don't think many businesses use MySQL when they can use PostgreSQL. Oracle is used very often. MSSQL in stupid cases.
You obviously need databases to, eh, store data, index it, process it, access it.
Also, as others say, it's a wide concept. A file system is a database. In some sense BitTorrent DHT is a database.
MSSQL in Microsoft* cases
FTFY although arguably Microsoft and Stupid and synonyms