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What are PostgreSQL schemas and how do you use them?
Schemas in PostgreSQL are namespaces that allow you to organize and group database objects like tables, views, and functions. Each schema can contain its own set of objects, and you can refer to these objects with a schema-qualified name. For example, to create a schema and a table within it, you might use `CREATE SCHEMA sales; CREATE TABLE sales.orders (id SERIAL PRIMARY KEY, order_date DATE);`.
Schemas in PostgreSQL are namespaces that allow you to organize and group database objects like tables, views, and functions. Each schema can contain its own set of objects, and you can refer to these objects with a schema-qualified name. For example, to create a schema and a table within it, you might use `CREATE SCHEMA sales; CREATE TABLE sales.orders (id SERIAL PRIMARY KEY, order_date DATE);`.