![]() ![]() In this article, I will show you how to design and build a relational database from scratch in Postgres for John’s ecommerce business. After that, he wants you to analyze the data to come up with analytics represented visually so that he can monitor the business performance. The data the client wants to be stored in the database is data related to items on sale, orders made, and customers who make the orders. John then asks you to design and build a relational database that will enable him to store important information that his ecommerce business generates. You can use a subquery in the WHERE clause of an INSERT statement to select data from one or more tables and insert them into a new table.As a data analyst, a client called John approaches you and tells you that he is starting an online ecommerce business. Let's see how to use SQL subqueries in these SQL statements. Subqueries in CRUD OperationsĬRUD stands for Create, Read, Update, and Delete and includes the four most common SQL statements you generally perform in a database: Let’s now look at some examples to understand the syntax required by SQL subqueries. These rules define how you can use a subquery in SQL.
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