As a matter of fact to avoid all the alternatives, that was used by various engineers, SQL were introduced.
No one will stop you if you start producing your own way to retrieve data.
If you look at mysql table engine you would see there is lots of data storing engine, the easiest one is CSV, XML engine. If you use CSV for storing data then all data will be stored as CSV, but still it will use same SQL to retrieve and store data.
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