INDEX rides_auto_index_fk_city_ref_users (city ASC, rider_id ASC), ) LOCALITY REGIONAL BY TABLE IN PRIMARY REGION ĬONSTRAINT rides_pkey PRIMARY KEY (city ASC, id ASC), INDEX vehicles_auto_index_fk_city_ref_users (city ASC, owner_id ASC) This command opens an interactive SQL shell to a temporary, multi-node in-memory cluster with the movr database preloaded and set as the current database.Ĭrdb_region public.crdb_internal_region NOT VISIBLE NOT NULL DEFAULT default_to_database_primary_region(gateway_region())::public.crdb_internal_region,ĬONSTRAINT users_pkey PRIMARY KEY (city ASC, id ASC)ĬOMMENT ON TABLE ers IS 'This table contains information about users.' ĬONSTRAINT vehicles_pkey PRIMARY KEY (city ASC, id ASC), To follow along, run cockroach demo with the -nodes and -demo-locality flags. For more information about the MovR example application and dataset, see MovR: A Global Vehicle-sharing App. The following examples use MovR, a fictional vehicle-sharing application, to demonstrate CockroachDB SQL statements. The CREATE statement for the database, function, table, view, or sequence. The name of the table, view, or sequence. Show the CREATE statements for all types in the current database. Show the CREATE statements for all schemas in the current database. The ALTER statements follow the CREATE statements to guarantee that all objects are added before their references. As a result, SHOW CREATE ALL TABLES also returns the ALTER statements that add, modify, and validate an object's constraints. This option is intended to provide the statements required to recreate the objects in the current database. Show the CREATE statements for all tables, views, and sequences in the current database. The name of the database, function, table, view, or sequence for which to show the CREATE statement. One of the more interesting to me relates right back to those template databases.SHOW CREATE object_name opt_show_create_format_options ALL SCHEMAS TABLES TYPES Parameters Parameter The CREATE DATABASE command has a number of options, as you can see in the documentation. Also, when you restore a database, PostgreSQL uses template0 to start that process (I’ll explain how and why once I learn).Īnd what about that postgres database? Well, that’s a default built into PostgreSQL so that tools always connect to a default database. What’s that? Well, in the event you completely mess up template1, template0 acts as a baseline. However, there’s more going on in PostgreSQL. You can add objects to template1, and then they will automatically exist in any other new database you create. The table template1 operates very similarly to model. In PostgreSQL, the same thing happens, but the database is called template1. In SQL Server, you have a system database called model used as a template when you create a new database. Since I know SQL Server, I’m going to compare what’s going on here, to what’s going on there. The command to create a database is quite simple: I don’t want to document every single possible method, so I had to pick one.I’m old, and I’m just more comfortable working on code within a dedicated coding tool as opposed to simply running it from the command line.For example, it plugs in very nicely to GitHub, so you can easily keep the code as you develop it up on GitHub ( go here if you want to see my VERY basic PostgreSQL code: ). I’m going to focus there, working primarily within Azure Data Studio (ADS). Finally, the SQL commands are available once you’re connected to PostgreSQL. You can do everything from a command line or use a graphical user interface (GUI) that lets you work with PostgreSQL. I could then back them up.Īs with any data management system, there are many ways to get this done. I needed to create a database and a couple of tables. However, I realized I had another thing I needed to do before I could begin learning – and teaching - backups. Now, what to do with it? In the first article in this series, I said I would start by learning about backups. You have an instance of PostgreSQL running locally (or you’re connected to the cloud).
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