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Run the below query to view all the databases in Postgres. select oid as db_id, datname as db_name, datallowconn from

Below is the syntax to add the not null constraint to a table column in postgres database ALTER TABLE table_name

You can view the explain plan of any query by prefixing the query with EXPLAIN keyword as shown below: EXPLAIN

A Table is a database object that holds data. You must specify table name, column names and their data types

A view is a named query stored in the database. A view does not store any data like a table

Syntax to drop trigger in Postgres database: DROP TRIGGER triggername ON tablename;

Below is the syntax to rename a table in Postgres where tablename is the current name of the table and

Below is the syntax to rename a constraint in Postgres database where table_name is the name of the table and

Syntax to drop a tablespace in Postgres: DROP TABLESPACE tablespace_name;

You can remove a user defined data type using below syntax: DROP TYPE typename;