PostgreSQL – How to Drop A Schema

ByAdmin September 5, 2023September 5, 2023

To drop a schema in PostgreSQL, you can use the DROP SCHEMA statement. Here’s the basic syntax for dropping a schema:

DROP SCHEMA schema_name [ CASCADE ];

where schema_name is the name of the schema you want to drop. The optional CASCADE keyword is used to automatically drop all objects (tables, views, functions, etc.) within the schema before dropping the schema itself. Be very careful when using CASCADE, as it will permanently remove all objects in the schema.

Be cautious when using CASCADE as it will permanently remove all objects in the schema. Make sure you have a backup and that you are certain about dropping the schema before executing the command, especially in a production environment.

How-To Guides

PostgreSQL – How to Add a Unique Constraint

ByAdmin August 30, 2023August 30, 2023

You can add a unique constraint to a table column using the ALTER TABLE statement. A unique constraint ensures that all values in a column are unique, meaning no two rows can have the same value in that column. Below is the syntax add a unique constraint: ALTER TABLE table_name ADD CONSTRAINT constraint_name UNIQUE (column_name);…

How-To Guides

PostgreSQL – How to Delete Duplicate Rows in PostgreSQL Database

ByAdmin November 10, 2023November 10, 2023

To delete duplicate rows in PostgreSQL using a self-join, you can use the DELETE statement along with a self-join condition. Here’s the syntax: DELETE FROM your_table a USING your_table b WHERE a.column_name = b.column_name AND a.ctid < b.ctid; where your_table is the actual name of your table, and column_name is the column that you want…

How-To Guides

PostgreSQL – How to Get Month From a Date

ByAdmin September 20, 2023September 20, 2023

To extract the month from a date in PostgreSQL, you can use the EXTRACT function. Here’s an example: SELECT EXTRACT(MONTH FROM your_date_column) AS month FROM your_table; where your_date_column is the name of your date column and your_table is the name of your table. In this query, EXTRACT(MONTH FROM your_date_column) is used to extract the month…

How-To Guides

PostgreSQL – How to add Column to a Table

ByAdmin August 30, 2023August 30, 2023

To add a new column to an existing table in PostgreSQL, you can use the ALTER TABLE statement. Below is the basic syntax of adding a new column: ALTER TABLE table_name ADD COLUMN new_column_name data_type; where table_name is the name of the table to which you want to add the new column. new_column_name is the…

How-To Guides

PostgreSQL – How to Drop a Materialized View

ByAdmin September 14, 2023September 14, 2023

You can drop (delete) a materialized view using the DROP MATERIALIZED VIEW statement in PostgreSQL database. Here’s the basic syntax: DROP MATERIALIZED VIEW IF EXISTS view_name; where Here’s an example of dropping a materialized view named total_sales_by_product: DROP MATERIALIZED VIEW IF EXISTS total_sales_by_product; Make sure you exercise caution when using the DROP statement, as it…

How-To Guides

PostgreSQL – How to Retrieve the Size of A Database

ByAdmin September 7, 2023September 7, 2023

To get the size of a PostgreSQL database, you can use a few different methods, including SQL queries and command-line utilities. Here are a couple of approaches: Using SQL Query You can use the following SQL query to get the size of a specific database in PostgreSQL: SELECT pg_size_pretty(pg_database_size(‘your_database_name’)) AS database_size; where your_database_name is the…

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