Introduction to PostgreSQL Database PostgreSQL database is an open-source database system and also an object-relational database system. It is accessed by using the psql command; the current latest version of PostgreSQL is 12; we create a database using create database statement and drop the d...
PostgreSQL 9.2 and above: SELECTpg_terminate_backend(pg_stat_activity.pid)FROMpg_stat_activityWHEREpg_stat_activity.datname='TARGET_DB'ANDpid<>pg_backend_pid(); Once you disconnect everyone you will have to disconnect and issue the DROP DATABASE command from a connection from another database ...
To store the data of the database, we need to offer some location to the data on the disk. This location is called the tablespace in PostgreSQL. The data can be tables, triggers indexes, etc. However, if a tablespace is no longer needed, it can be dropped in PostgreSQL. The tablespac...
To rename a database in PostgreSQL, you can use theALTER DATABASEstatement followed by theRENAME TOclause. For example, to rename a table from "old_name" to "new_name", execute: Copy 1ALTER TABLEold_nameRENAME TOnew_name; Does pg_terminate_backend() drop connections together or one by...
A single PostgreSQL server can contain many databases. Let’s explore three different approaches to list databases in PostgreSQL!
How to Create Database Objects in Postgres Using CREATE Command? Bonus Tip 1: CREATE USER Bonus Tip 2: CREATE SCHEMA Bonus Tip 3: Drop Database Objects Conclusion What is a Database and How to Create it in Postgres? Databases are the systematic collection of structured data/information, whic...
How to Create a Table in SQL An Overview of PostgreSQL Data Types Understanding Numerical Data Types in SQL Comparing TRUNCATE TABLE, DELETE, and DROP TABLE in SQL What Is the DELETE Statement in SQL? See also: How to Remove a Primary Key in SQL How to remove a unique constraint in SQL...
How to drop the foreign key in PostgreSQL? We must install PostgreSQL in our system. Require basic knowledge about PostgreSQL and the key constraints of the database table. We must require a database table to perform foreign key constraints. ...
After renaming, we revert the database to the multi-user mode: ALTER DATABASE NewUniversity SET MULTI_USER; 3. In PostgreSQL Like SQL Server, PostgreSQL also supports ALTER DATABASE statements for renaming a database but there’s a slight difference in the syntax. However, while SQL Server ...
So there’s an easy way to rename a database in MySQL is to create a new empty database, then rename each table in turn into the new database: RENAME TABLE db_name.table TO new_db_name.table; Note that this command does not work for views, so you have to drop and create view ...