Steam Learn: Zen SQL
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The document discusses best practices for SQL querying and database design, emphasizing simplicity and readability in database schemas and queries. It advocates for clear documentation, avoiding overengineering, and awareness of weaknesses in query complexity. Key takeaways include refining schemas before creating queries, familiarity with SQL tools, and applying good coding practices to SQL.
Steam Learn: Zen SQL
- 1. 8th of October 2014 Zen SQL Best practices to query and database design by Clément Prévost
- 2. 8th of October 2014 The Zen way to SQL ● State of the art ● Readability best practices: a. Database schema b. Query
- 3. 8th of October 2014 State of the art ● ORM (Doctrine, ActiveRecord, ...) ○ Hides the database schema and queries, follow your applicative coding best practices ● Query Builder (ZendDbSql, …) ○ Hides the queries, not the schema ● Raw (Migration scripts, performance critical task, Analytics) ○ DIY
- 4. 8th of October 2014 The Zen way to SQL ● State of the art ● Readability best practices: a. Database schema b. Query
- 5. a) Database schema best practices 8th of October 2014 A. KISS ○ Beware of overengineering ○ Don’t let optimizations get in the way of simplicity B. Explicitness is the key ○ Ban abbreviations, “status” column and add comments C. Your business WILL evolve, same with your schema ○ Never be afraid to refactor, rename and move stuff around
- 6. 8th of October 2014 Case study: Database schema BP
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- 8. 8th of October 2014 The Zen way to SQL ● State of the art ● Readability best practices: a. Database schema b. Query
- 9. 8th of October 2014 b) Query best practices A. Comments and documentation, Avoid deep nesting, Reuse external libraries B. Know your enemy: Long vs. complex queries C. Tools: IDE, Database specificity, SQL capabilities
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- 13. 8th of October 2014 Key things to remember ● Work it step by step ○ Have a perfect schema, then work on beautiful queries ● Know your tools, learn advanced SQL ● You already know how ○ Good coding practices also apply to SQL (queries AND schema)
- 14. 8th of October 2014 Questions ? For online questions, please leave a comment on the article.
- 15. 8th of October 2014 Join the community ! (in Paris) Social networks : ● Follow us on Twitter : https://twitter.com/steamlearn ● Like us on Facebook : https://www.facebook.com/steamlearn SteamLearn is an Inovia initiative : inovia.fr You wish to be in the audience ? Contact us at learn@steamhouse.fr
- 16. 8th of October 2014 Sources 1. http://www.slideshare.net/Samuel90/software-development-vs-software-maintenance 2. http://code.tutsplus.com/tutorials/top-15-best-practices-for-writing-super-readable-code--net- 8118 3. http://www.postgresql.org/docs/9.3/static/view-pg-available-extensions.html 4. http://postgres-bits.herokuapp.com/ 5. http://www.postgresql.org/docs/9.3/static/index.html