Postgres and Open Source Experts

To create, update and drop tables in PostgreSQL container, build and run PostgreSQL container and connect with Database Server. Then, perform these operations.

In PostgreSQL, the WHERE clause filters the data of each row and then groups the data while the HAVING clause filters the grouped data.

This blog presented a cheat sheet that assists us in working with the Postgres databases, schemas, tables, and users/roles, efficiently.

The LIKE operator matches the search expression with the specified pattern and retrieves true if the match is found. The NOT LIKE operator negates the results of the LIKE operator.

To connect PostgreSQL to Java via JDBC, integrate Postgres JDBC Driver with Java, and establish a new connection. After this, you can execute PostgreSQL Queries from Java.

The Postgres LENGTH() function accepts a string as an argument and calculates the total number of characters in that particular string.

In PostgreSQL, the “\l” command and “pg_databases” catalog are used to show the list of databases. Use the “\l+” command to show databases with more details.

A Postgres database can be created using “CREATE DATABASE” or “createdb” commands. The difference is that the “createdb” can be executed from the command prompt.

To install PostgreSQL on the Arch system, use the default Pacman package manager tool. More specifically, using the “sudo pacman -S postgresql” command.

In PostgreSQL, the LIMIT clause and OFFSET clause allow us to retrieve only a subset of data returned/generated by the SELECT query.