However, NoSQL databases are a bit like Hadoop — they had early promise but it fizzled. After 10 years of the NoSQL “revolution,” SQL databases remain the bulk of the database market.

Lesson 4 Filtering Data We often want to “subset” our data. That is, we only want to look at data for a certain year, or from a certain class products or customers. We generally call this process ...

We often want to “subset” our data. That is, we only want to look at data for a certain year, or from a certain class products or customers. We generally call this process “filtering” in Excel or ...