Last updated: May 19, 2020
Learning about SQL
- Select Star SQL, a free, online, interactive “book” for learning SQL essentials. It looks like it would probably take a few hours to go through as a beginner, and the content seems great.
- My own SQL Joins guide, which goes through all the different types of joins with examples and queries.
- For improving query performance, take a look at 10 Ways to Tweak Slow SQL Queries by Helen Anderson.
- T-SQL (the SQL dialect for Microsoft SQL Server)