Database basics for new-ish developers -- All Things Open October 18th 2021
- 1. Database Basics for New-ish Developers
- 2. HELLO! I am Dave Stokes I am a MySQL Community Manager [email protected] @stokes 2
- 3. Database A database is an organized collection of data stored and accessed electronically from a computer system 3
- 4. Why Databases Are Hard Different Mindset Than Programming 1 4
- 5. “ The relational model for database management is an approach to managing data using a structure and language consistent with logic -- Wikipedia 5
- 6. Think of Data Being In Sets ◉ Data segmented by logical group ◉ Sales data ◉ Customer information ◉ Shipping ◉ Production ◉ Join various logical groups together when needed ◉ Eliminate redundancy 6
- 7. Works With Data Sets Describe what you want the data returned to you looks like. Structured Query Language 1970s Design (but still relevant) Designed to minimize data duplication. Retrieve multiple records with one command. 7
- 8. Procedural Programs Data Work with one record at a time, looping to get others Record One row of data Columns Items of data 8
- 9. Database Data Table with sets of data, multiple tables linked together Records Sets of data filtered as needed Columns Items of data 9
- 10. Your Database Server is like a library Think of a table like a book with all the information on one subject between the covers. Try to avoid tearing out one page, reading that page, and the going to tear out the next page. 10
- 11. Getting Started With Databases Open Source Database 2 11
- 12. Free Open Source Database Many choices for software Lots of documentation, examples, guides, videos on line Reddit, forums, Slack, ... Cloud options 12
- 13. How to learn 1. Try examples, make subtle changes 2. Break things, learn how to fix them 3. Create your own database from scratch 4. Work with your favorite programming language 13
- 14. Directed advice for programmers 1. Think in SETS!!!! 2. Check return codes for errors and warnings 3. Reinventing the wheel is a waste of time a. Normalize data -- third normal form or better! b. Think about how you are using the data, build architecture around that use. 4. Object Relational Mappers are extra complexity a. LEARN SQL 14
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- 16. Structured Query Language SQL 316
- 17. 17 Declarative Language Tell the server what you want
- 18. 18 Dave’s Pizza Analogy SQL Specify crust Specify sauce Specify toppings Your Programming Language Grow wheat for crust Harvest wheat for crust Turn wheat into flour Obtain water to mix with flour Find Stirring tool Mix water and flour in bowl Check dough consistency Let dough rise Shape dough
- 19. 19 Declarative Language In a similar sense to object–relational impedance mismatch, a mismatch occurs between the declarative SQL language and the procedural languages in which SQL is typically embedded.
- 20. Example: Your Own Shipping Department Orders Table List of items ordered by customers 20 Customers Table Get customer payment and shipping information Shipping Table Pack/ship orders
- 21. Example: Your Own Shipping Department Orders Table List of items ordered by customers 21 Customers Table Get customer payment and shipping information Shipping Table Pack/ship orders
- 22. Example: Your Own Shipping Department Orders Table List of items ordered by customers 22 Customers Table Get customer payment and shipping information Shipping Table Pack/ship orders
- 23. 23 Sold but not shipped Shipping issues? Free stuff? Orders processed What information is available?
- 24. 24 SELECT customer.name, order.number, customer.shiping_address FROM customer JOIN order on (order.customer_id = customer.customer_id) WHERE order.shipped = 0 AND order.packed = 1 AND order.paid_ok = 1; Example query to determine orders that are ready to ship.
- 25. Test Drive MySQL Database Service For Free Today Get $300 in credits and try MySQL Database Service free for 30 days. https://www.oracle.com/cloud/free/ Copyright © 2021, Oracle and/or its affiliates 25
- 26. 26 Please Buy My Book If you are interested in the JSON data type in MySQL or the NoSQL JSON Document Store then you need this book! Available on Amazon.com!
- 27. THANKS! Any questions? You can find me at @stoker / [email protected] & MySQL Booth on Virtual Expo Hall 27 Slides at slideshare.net/davestokes