![]() ![]() JOINs are also easier to read as the queries become more complex. While subqueries may be easier to understand and use for many SQL users, JOINs are often more efficient. SQL beginners often use subqueries when the same results can be achieved with JOINs. We will use these two tables to write complex queries with subqueries and JOINs. city: the city where the product was sold.year: the year in which the product was sold.product_id: the identifier of the product sold.city: the city in which the product was made.This table contains the following columns: We will describe the various scenarios below.Ĭonsider two simple tables, product and sale, which we will use in our examples. Sometimes you have a choice of either, but there are cases in which a subquery is the only real option. Subqueries and JOINs can both be used in a complex query to select data from multiple tables, but they do so in different ways. ![]()
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