Postgres and Open Source Experts

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.

To install PostgreSQL on CentOS, execute the “sudo yum install postgresql-server postgresql-contrib” script.

In PostgreSQL, CARDINALITY() is an array function that counts the total number of array elements. The return type of the stated function is INT.

In PostgreSQL, the “pg_ctl” command and “services manager” can be used to restart the Postgres server on the Windows operating system.