PostgreSQL – How to List All Materialized Views

ByAdmin September 8, 2023September 8, 2023

To list the materialized views in a PostgreSQL database, you can query the system catalog tables. Materialized views are stored as objects in the database, and you can query the catalog to retrieve information about them. Here’s a query to list all materialized views in a PostgreSQL database:

SELECT schemaname, matviewname FROM pg_matviews;

Above query selects the schema name and materialized view name from the pg_matviews catalog table, which contains information about all the materialized views in the current database.

If you want to see more details about the materialized views, you can use the following query to retrieve additional information:

SELECT schemaname, matviewname, matviewowner, ispopulated, definition FROM pg_matviews;

This query includes the owner of each materialized view, whether the materialized view is populated (i.e., whether it contains data), and the SQL definition of the materialized view.

You can execute these queries using a PostgreSQL client like psql or any other tool that can connect to your PostgreSQL database.

How-To Guides

PostgreSQL – How to Rename a Constraint

ByAdmin September 14, 2023September 14, 2023

You can rename a constraint in PostgreSQL database using the ALTER TABLE statement. Renaming a constraint is useful when you want to give it a more meaningful or descriptive name or if you need to change its name for any other reason. Here’s the basic syntax for renaming a constraint: ALTER TABLE table_name RENAME CONSTRAINT…

How-To Guides

PostgreSQL – How to Create A Sequence

ByAdmin September 6, 2023September 6, 2023

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How-To Guides

PostgreSQL – How to Drop A Column

ByAdmin September 5, 2023September 5, 2023

To drop a column in PostgreSQL, you can use the ALTER TABLE statement with the DROP COLUMN clause. Here’s the basic syntax for dropping a column: ALTER TABLE table_name DROP COLUMN column_name; where table_name is the name of the table from which you want to drop the column, and column_name is the name of the…

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…

How-To Guides

PostgreSQL – How to Refresh a Materialized View

ByAdmin September 14, 2023September 14, 2023

You can refresh the data in a materialized view using the REFRESH MATERIALIZED VIEW statement in PostgreSQL database. A materialized view stores a snapshot of the data from the underlying tables, and this data can become stale over time. The REFRESH MATERIALIZED VIEW command allows you to update the materialized view with the latest data…

How-To Guides

PostgreSQL – How to Rename a User

ByAdmin September 8, 2023September 8, 2023

To rename a user in PostgreSQL, you can use the ALTER USER statement. Here’s the basic syntax: ALTER USER old_username RENAME TO new_username; where old_username is the current username you want to rename and new_username is the new username you want to assign. Below is an example: ALTER USER myuser RENAME TO newuser; This sql…

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