PostgreSQL – Rename Table

ByAdmin June 3, 2023June 3, 2023

To rename a table in PostgreSQL, you can use the ALTER TABLE statement with the RENAME TO clause. The syntax is as shown below:

ALTER TABLE current_table_name RENAME TO new_table_name;

current_table_name is the name of the table you would like to rename, and new_table_name is the new name you would like to give to the table.

Example: if you would like to rename a table named employees to staff, you can use the following command:

ALTER TABLE employees RENAME TO staff;

Renaming a table is a quick operation that does not require any copying of data. Only the metadata is updated. Even if your table is very large, the rename operation completes almost instantly.

Table Management

PostgreSQL – Modify Datatype

ByAdmin August 6, 2023August 6, 2023

You can modify the datatype of a column in a table using the ALTER TABLE statement. However, changing the datatype of a column can lead to data loss or unexpected behavior if the new datatype cannot fully accommodate the existing data. Always, backup your data before making any changes. Below are the steps to modify…

Table Management

PostgreSQL – CREATE TABLE AS Statement

ByAdmin August 30, 2023August 30, 2023

The CREATE TABLE AS statement is used to create a new table based on the result of a query. It allows you to create a new table that holds the data returned by a SELECT query or a subset of the data from an existing table. Here’s the basic syntax of the CREATE TABLE AS…

Table Management

PostgreSQL – Create Table

ByAdmin June 1, 2023June 7, 2023

Below is the sql command syntax to create a table in PostgreSQL database: CREATE TABLE table_name ( column1 datatype1 constraint1, column2 datatype2 constraint2, column3 datatype3 constraint3, … ); Below is an example of how to create a table in PostgreSQL database with two columns: CREATE TABLE employees ( employee_id integer, employee_name text ); Above sql…

Table Management

PostgreSQL – DROP TABLE

ByAdmin August 6, 2023August 6, 2023

In PostgreSQL, you can drop a table using the DROP TABLE statement. Dropping a table will permanently delete all the data and associated objects (such as indexes, triggers, and rules) related to that table. Make sure to take a backup of your data before executing the drop operation. The basic syntax to drop a table…

Table Management

PostgreSQL – DROP COLUMN

ByAdmin August 6, 2023August 6, 2023

You can drop a column from a table in PostgreSQL using the ALTER TABLE statement with the DROP COLUMN clause. Dropping a column will permanently remove the column and all its data from the table. Always backup your data before performing this operation. The basic syntax to drop a column is as below: ALTER TABLE…

Table Management

PostgreSQL – Add Column to a Table

ByAdmin June 7, 2023June 7, 2023

To add a new column to a table in PostgreSQL, you can use the ALTER TABLE statement with the ADD COLUMN clause. Below is the syntax: ALTER TABLE table_name ADD COLUMN column_name data_type [column_constraints]; Where: Example, to add a new column called “email” of type varchar(255) to a table called “users”, you can use the…

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