Postgres and Open Source Experts

A subquery in PostgreSQL is nothing more than a query within another query. It is also called a nested query, inner query, or inner select.

In PL/pgSQL, the record types are used to create the variables that can store a complete row/record of a result set.

In Postgres, the “ROW_NUMBER()” function is used with the OVER clause to operate on a set of rows and assigns a unique integer to each row.

In Postgres, constants are nothing but immutable or unchangeable variables. Once a constant is initialized with a value, it stays the same throughout the program.

PostgreSQL supports a “PL/pgSQL SELECT INTO” statement that assists us in storing the table's data into a specific variable.

In PostgreSQL, the SET SEARCH_PATH command is used to set the schema search path. The “SHOW” command is used to demonstrate the current schema search path.

The inbuilt date functions like NOW(), CURRENT_TIMESTAMP, and LOCALTIMESTAMP, are used with the INSERT statement to add the current timestamp into a Postgres table.

In PL/pgSQL, the row-type variables aka row variables are used to store a complete record of a result set into a specific variable.

The Postgres server can be restarted using the “/etc/init.d/postgresql restart” or “sudo systemctl restart postgresql” commands.

In Postgres, CEILING() is a built-in math function that accepts a numeric or double precision value and converts it into the nearest integer toward the positive infinity.