Nested Query

A nested query is like a puzzle within a puzzle, or to put it more technically, it’s a query inside another query in a database. In business intelligence and data analytics, this is a handy tool because it allows analysts to be very specific about the information they’re trying to pull from a large and complex database. Think of it as asking a detailed question and, based on that answer, asking an even more precise follow-up question.

For example, a company might use a nested query to find out which customers from a certain city made purchases over $100 in the last month. The first part of the query sorts out all the customers from the specific city, and the nested part digs deeper to filter down to those who made larger purchases within the desired timeframe. This level of detail helps businesses understand their customers better and make more informed decisions.

Using nested queries allows analysts to extract meaningful insights without having to sift through irrelevant data manually. It saves time and makes the data more manageable—imagine trying to find a needle in a haystack, but with a magnet that’s designed to only attract that needle. That’s the kind of efficiency nested queries can provide in data analytics.