Experts in Postgres and Open Source Infrastructure

LEFT JOIN is used in the PostgreSQL database to return all the records from the left table and matched records from the right table.

In PostgreSQL, RIGHT JOIN is used to merge two tables in the database and return all records of the Right table and only matched records from the left one.

In PostgreSQL, indexes can be created using the CREATE INDEX statement followed by the index name and then providing the table name inside the ON condition.

To create a materialized view in Postgres, execute the CREATE MATERIALIZED VIEW statement along with the AS keyword followed by the base query.

The index can be changed in PostgreSQL using an ALTER INDEX statement containing the name of the index and then adding conditions to be applied to change it.

In PostgreSQL, the nextval() function fetches the next value from the sequence to add the incremented value to the existing value of the sequence.

In PostgreSQL, indexes can be dropped using the DROP INDEX command followed by the index name or names for dropping multiple indexes using a single query.

To set up ODBC drivers for PostgreSQL, download the executable file and install it on the system. After that, configure the driver by adding a data source to it.

The ROLLUP is the sub-clause of the GROUP BY in PostgreSQL which assumes the hierarchy among the columns to reduce the number of subsets in the report.

CROSS JOIN is used in the PostgreSQL database to return the cartesian product of the two tables on which the CROSS JOIN is applied.