SQL or rather the "language" is very useful to know if you're in the tech field. Almost every line-of-business application uses some form of database and most have similar syntax. Quite often to solve issues, deal with upgrades, etc, etc you end up under the hood running queries and jobs.
Would I "BUY" SQL for my personal device. No. You can download MSSQL express (it's got all the features you need for learning). You can also download "free" versions of Microsoft Visual Studio if you'd like to play with programming.
Someone else mentioned MS ACCESS but that's rarely used in larger operations. It's just too limited and clunky.
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