SQL
From wikinotes
The SQL spec is standardized by ISO/ANSI and must be purchased.
It's difficult to validate these notes without it.
This attempts to document the more general SQL-ish features available across SQL databases.
Documentation
SQL spec (unofficial) https://jakewheat.github.io/sql-overview/
Challenges
https://quip.com/2gwZArKuWk7W
Notes
General
sql: datatypes sql: optimization Mutations
sql: mutations Queries
sql: queries sql: joins sql: comparison operators sql: aggregate functions