![]() Public | t_product_id_seq | sequence | hs The table can be found in the desired schema. In a default scenario, a table will end up in the public schema. How can we find out which schemas there are in PostgreSQL? psql provides the \dn command to display this information: ![]() The reason is the existence of the public schema, which is there by default. The beauty of PostgreSQL is that it doesn’t matter much if you know nothing at all about schemas. The first thing we have to look at is the public schema. Now we can focus on how this concept can be applied to PostgreSQL. It’s simply like organizing pictures: You wouldn’t put all of them into the same folder, but rather group them by year, location, etc. Let’s assume there’s a fairly large data structure: Having 500 tables in one place is certainly harder to manage and understand than to have 10 buckets containing 50 tables each. Schemas group tablesīasically, schemas are a way to group tables together. What is important is the next layer down, between databases and tables: Schemas. In reality this is what you connect to: in PostgreSQL a connection is always bound to a database inside an instance, which happens early on, right after user authentication. To understand that, first take a look at how PostgreSQL is structured:Īn “instance” is basically what you start when you deploy PostgreSQL. The purpose of a schemaīefore you figure out how to use schemas, you need to know what the purpose of a schema is in the first place. ![]() What is a schema in PostgreSQL? And more importantly: What is the purpose of a schema and how can schemas be used to make your life easier? Let’s dive in and find out. One way to organize data in PostgreSQL is to make use of schemas.
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