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[Learning Notes] Presto

What is Presto?
Presto is an open source distributed SQL query engine for running interactive analytic queries against data sources of all sizes ranging from gigabytes to petabytes...
Presto allows querying data where it lives, including Hive, Cassandra, relational databases or even proprietary data stores. A single Presto query can combine data from multiple sources, allowing for analytics across your entire organization.
-- https://prestodb.io/
ArchitecturePresto system components:
Coordinator: responsible for parsing statements, planning queries, and managing Presto worker nodes.
Worker: responsible for executing tasks and processing data.
Connectors: Storage plugins are called as connectors. Hive, HBase, MySQL, Cassandra and many more act as a connector; otherwise you can also implement a custom one.

SQL Statements Cheat Sheet
1. Join SELECT * FROM table1 JOIN table2 ON table1.a = table2.b
2. Inner Join vs. Outer Join https://www.diffen.com/difference/Inner_Join_vs_Outer_Join
3. If-else case S…

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