Summary
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.
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