Postgres and Open Source Experts

In PostgreSQL, the DISTINCT ON clause works similarly to the DISTINCT clause as it returns the unique records of data after discarding the duplicate records.

The TIMETZ data type stores the time information with the timezone. This data type is used to store the data where the timezone is considered to be important.

To Create a user-defined data type in PostgreSQL, users can use either the CREATE DOMAIN statement or the CREATE TYPE statement.

The json_extract_path() function is a JSON function that is used to extract the values from the JSON data. The path of the values that are to be fetched is specified as an argument in the function.

Arrays are among the most commonly used data types in Postgres. In Postgres, the WHERE clause is used with arrays to get and update the records as per users requirements

The GROUP BY clause and SUM() function are used together when we want to calculate the sum of values based on the specific groups.

In PostgreSQL, the extensions can be created by using the CREATE EXTENSION statement which is followed by the name of the extension.

In PostgreSQL, the log functions are used to find the logarithm of a particular number(provided in the function as a parameter). These functions include: log(), ln(), and log10().

In PostgreSQL, the extensions can be dropped by using the DROP EXTENSION statement which is followed by the name of the extension.

We can switch a user in PostgreSQL by simply executing the SET ROLE command. But the point to be noted is that we can only switch the user if it already exists.