PostgreSQL – Rename Table

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…

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…

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…

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…

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…

To rename a column in PostgreSQL, you can use the ALTER TABLE statement with the RENAME COLUMN option. Below is the syntax: ALTER TABLE table_name RENAME COLUMN old_column_name TO new_column_name; Where table_name is the name of the table and old_column_name and new_column_name are the current name of the column and new name of the column….