PostgreSQL – Rename Column

ByAdmin June 3, 2023June 3, 2023

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. Example: Use the below command to rename a column name to full_name in table employees.

ALTER TABLE employees RENAME COLUMN name TO full_name;

When you rename a column, the new column name must not already exist in the table. Renaming a column will not affect any data stored in the column.

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 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 – 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 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 – 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 – 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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