Postgres and Open Source Experts

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.

PERCENT_CONT and PERCENT_DISC are analytic functions that are used to calculate the percentile/median in the PostgreSQL database.

PostgreSQL supports a “continue” statement that lets us skip the loop’s current iteration and proceed to the subsequent iteration.

Terminating the loop before its actual ending point or condition can be done using the “Exit” statement in the PostgreSQL query.

While loop is used in PostgreSQL to apply multiple iterations on the query by checking the condition for each iteration before executing the body of the loop.

The for loop in Postgres is used to iterate/traverse over a specific range or a result set. You can use and customize it according to your requirements.

In PostgreSQL, the PERCENT_RANK function can be used with PARTITION BY and ORDER BY clauses using ascending and descending order to get a rank for each row.

The CUBE clause in PostgreSQL can be used under the GROUP BY clause to apply an aggregate function on multilevel columns to generate reports.