SQL

NOTE:

The SQL spec is standardized by ISO/ANSI and must be purchased

Documentation

SQL spec (unofficial)

https://jakewheat.github.io/sql-overview/

Challenges

https://quip.com/2gwZArKuWk7W

Notes

sql: datatypes

sql: structures

sql: queries

sql: mutations

sql: comparison operators

sql: joins

sql: dates

sql: aggregate functions

sql: optimization