Growing a SQL Query

1. Growing a SQL Query
RobertoVitillo, Data PlatformTeam
Mozilla London All Hands

2. Raw data (think JSON)
Columnar storage (think Parquet)
Database engine (think Presto)

3. A lot has changed since SQL 92

4. Data should be used to answer questions
Let’s try to answer one…

5. DEMO

6. SQL dialects support complex nested
data structures
FACT #1

7. SQL has variables
(aka common table expressions)
FACT #2

8. SQL has for each loops
(aka lateral joins)
FACT #3

9. Window functions!
FACT #4