PostgreSQL throws an error if you delete a non-existent table. To avoid exceptions while deleting such a situation, add the IF EXISTS parameter after the DROP TABLE clause. If you want to delete a table used in constraints, views, or any other objects, you need to specify CASCADE after th...
Basic SELECT Query to Retrieve Tables Inside INFORMATION_SCHEMA in PostgreSQLA very simple query to get all the tables inside this SCHEMA would be to write something like this.select * from information_schema.tables This would return a table like this.Output:...
tablespace_name:Specify the name of the tablespace. If you do not specify the tablespace, the table will be created inpg_defaulttablespace PostgreSQL supports the following column constraints: PRIMARY KEY:The primary key identifies a record from the table uniquely. A PostgreSQL table can have only...
This document describes on how to log in to the PostgreSQL database on CloudCenter and use basic commands within the database (DB). How do you confirm that the DB is running and able to be connected to? Follow these command line inputs and outputs to confirm if you...
TheINSERT INTOstatement is the key to adding records to a table in PostgreSQL. Syntax and Usage The basic syntax is: INSERTINTOtable_name(column1,column2,column3,...) VALUES(value1,value2,value3,...); Simple Insertion Example Inserting a user into our previously created users table: ...
In PostgreSQL, the “\d” command, the “\d+” command, “information_schema”, and the “SELECT *” statements with the “FALSE” option are used to check the table’s structure. The “\d” and “\d+” are meta-commands and must be executed from the “SQL Shell” aka psql. Whil...
location. So let’s have a look inside one of the physical files and see if we can read anything. First, to make things easier let’s see what data we are looking for. So I created a table that just has some text values called and stored 3 rows in it - here is what it looks ...
PostgreSQL provides a RENAME COLUMN clause that is used with the collaboration of ALTER TABLE command to rename a column.
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...
You can use COUNT to check: SELECT COUNT(*) FROM address WHERE address_id = 100; But if you are looking for a faster query with a yes/no answer: SELECT EXISTS(SELECT 1 FROM address WHERE address_id = 100); Need a good GUI tool for PostgreSQL? Check out TablePlus. It’s native...