The information regarding PostgreSQL database functions is stored in thepg_procsystem table and theinformation_schema.routinessystem view. These sources can be queried to retrieve the necessary information. Using pg_proc: pg_procis a system catalog in PostgreSQL that stores details about functions and...
A single PostgreSQL server can contain many databases. Let’s explore three different approaches to list databases in PostgreSQL!
In PostgreSQL, you can easily retrieve the row count for each table in a database. This can be particularly useful for database analysis, monitoring, or reporting. There are a couple of methods to accomplish this, using either SQL queries that interact with PostgreSQL’s system catalog or by...
REFERENCES: value must exist in a column in another table After the columns are defined, table-wide constraints may be declared. Table-wide constraints can be either UNIQUE, PRIMARY KEY, CHECK, or REFERENCES. How to Create a Table in PostgreSQL Let's create a test table to pract...
SUMMARY: This article discusses table partitions, the benefits of using them to increase performance, and the types of partitions that can be used in PostgreSQL. With huge data being stored in databases, performance and scaling are two main factors that are affected. As table size increases with...
Or, if you want to display different tables sets, you may change the TABLE_SCHEMA to PUBLIC or PG_CATALOG.Running the same query in PSQL returns:Output:the PSQL Statement for INFORMATION_SCHEMA Listing (Working Update) in PostgreSQLTo view INFORMATION_SCHEMA in the PSQL console, you may issue...
This command will produce a table containing the users in the PostgreSQL server: The table returned by the "\du" command. Use \du+ to get additional information about each user, such as their description: The table returned by the "\du+" command. Note the "Description" column. Now for ...
In this article, we will learn how to create a table in PostgreSQL. I am going to explain the following topics: The syntax of the CREATE TABLE statement and the options that we can use while creating it The column and table constraints are supported by PostgreSQL ...
PostgreSQL Views Introduction to PostgreSQL Views In these articles, we will learn about PostgreSQL Views. Views are basically a query with a name; therefore, a view is useful for wrapping a commonly used complex query; we can represent data in the database tables using views named query, we...
Step 4: Describe the Altered/Modified Table Let’s execute the“\d”command to verify that the targeted table has been altered successfully: \dteam_details; The above snippet verifies the working of the“ALTER TABLE”command. How to Drop a Column in PostgreSQL?