Postgres and Open Source Experts

In PostgreSQL, the ORDER BY clause is used with the RANDOM() function to get the random data from large tables.

The ARRAY_AGG() function in Postgres is an aggregate function that takes a column as input and returns an array of values from all the rows in the specified group.

In Postgres, a time zone represents a region of the earth with a uniform standard time. Time zones allow us to convert local time to UTC or vice versa.

In Postgres, the NOW() and CURRENT_TIMESTAMP functions are used to fetch the current date and time with the time zone offset.

Postgres offers a DateTime function named LOCALTIME that retrieves the current time without a timezone. It may or may not accept an optional argument named “precision”.

In Postgres, the ILIKE operator performs the case-insensitive pattern matching on a string. Two wildcards are used to specify a pattern in ILIKE operator: an underscore “_” and a percent sign “%”.

PostgreSQL provides a Date function named CURRENT_DATE, which retrieves the current/today’s date. It retrieves the date in “YYYY-MM-DD” format.

PostgreSQL provides a built-in DateTime function named CURRENT_TIME that retrieves the current time with time zone offset.

In Postgres, a built-in function named “LOCALTIMESTAMP” is used to get today’s Date and Time without timezone information.

The STRING_AGG() function in Postgres is used to concatenate multiple strings into a single string, separated by a specific delimiter/separator.