This is a terse 5-minute explanation of how relational databases work:
- "An incredibly brief introduction to relational databases"
And these are a couple of YouTube videos explaining why a database is better than a spreadsheet at avoiding inefficient storage and at enforcing the consistency of your data:
- "What is a relational database?" (5:10 min)
- "Databases and SQL - an introducion" (9:57 min)
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