In this chapter, you learned to use SELECT
statements to discover the data you need. Then, we introduced Hive operations to link different datasets from vertical or horizontal directions using JOIN
or UNION ALL
. After going through this chapter, we should be able to use the SELECT
statement with different WHERE
conditions, LIMIT
, DISTINCT
, and complex subqueries. We should be able to understand and use different types of JOIN
statements to link the different datasets horizontally and UNION ALL
to combine the different datasets vertically.
In the next chapter, we will talk about the details of exchange, order, and transforming data as well as transactions in Hive.