PostgreSQL – How to Rename a Table

To add a NOT NULL constraint to an existing column in a PostgreSQL table, you can use the ALTER TABLE statement with the ALTER COLUMN clause. Here’s the basic syntax: ALTER TABLE table_name ALTER COLUMN column_name SET NOT NULL; where table_name is the name of the table you want to modify, and column_name is the…

Creating a materialized view in PostgreSQL involves using the CREATE MATERIALIZED VIEW statement. A materialized view is a precomputed and stored view of the data from one or more tables. Using materialized views can improve query performance by reducing the need to repeatedly compute the same complex queries. Here’s the basic syntax for creating a…

To get the version of your PostgreSQL database, you can use the SQL query below when connected to the database: SELECT version(); When you run this query, it will return a result similar to the following: PostgreSQL x.x.x on x86_64-pc-linux-gnu, compiled by … In the result, “x.x.x” represents the PostgreSQL version number. It also provides…

To drop (delete) a table in PostgreSQL, you can use the DROP TABLE statement. Here’s the basic syntax: DROP TABLE table_name; where table_name is the name of the table you want to drop. Here’s an example of how to use this syntax to drop a table named my_table: DROP TABLE my_table; Be very cautious when…

To drop all tables in a PostgreSQL schema, you can use SQL queries or a combination of SQL queries and shell scripting. SELECT ‘DROP TABLE IF EXISTS “‘ || schemaname || ‘”.”‘ || tablename || ‘” CASCADE;’ FROM pg_tables WHERE schemaname = ‘your_schema_name’;

You can rename a sequence using the ALTER SEQUENCE statement with the RENAME TO clause in PostgreSQL database. Here’s the basic syntax for renaming a sequence: ALTER SEQUENCE old_sequence_name RENAME TO new_sequence_name; where old_sequence_name is the current name of the sequence you want to rename, and new_sequence_name is the new name you want to assign…