Introduction to Subqueries
Explore how to use subqueries in T-SQL to automate data insertion and retrieval tasks efficiently. Understand the benefits of embedding queries within queries, and learn how to handle duplicates by applying DISTINCT and GROUP BY in your subqueries, improving database operations on large data sets.
We'll cover the following...
We'll cover the following...
A subquery is a query that is part of another large query. T-SQL queries can be complex and consist of multiple subqueries.
Why subqueries?
Let’s consider these tables for Schools and Students with the following structure.
The Schools table is newly created, and we want to fill ...