CTE, subquery, and view are all database programming constructs that allow you to create reusable and flexible queries.
SUBQUERY
A subquery is an embedded query within another query, typically in the WHERE clause of the main query. A subquery can be used to filter, sort or aggregate data, and nested to create complex queries.
VIEW
A view is a virtual table where you can program logic. They are simple to write, and they keep the processing at the server, but the results are generated at run time and can be slow if you’re handling a lot of data.
CTE
A Common Table Expression (CTE) is a temporary name assigned to a query that can be referenced multiple times in a larger query. CTEs are useful for creating recursive queries or queries that require complex logic. If you have a query that runs very inefficiently, converting it to use a CTE will often bring processing time way down.
Over the next few weeks we will look at some basic approaches to writing queries with some simple examples.
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