Postgres and Open Source Experts

In PostgreSQL, finding the interval between two dates can be accomplished using the built-in AGE() function or the minus “-” operator.

PostgreSQL provides a built-in TO_CHAR() function that converts the given timestamp to a string. It utilizes a format mask to convert the input value to a string.

In PostgreSQL, the EXTRACT() and DATE_PART() functions are used to extract a DOW(an acronym for Day of Week) from a date or timestamp.

In Postgres, a built-in function named TO_CHAR() is used to convert any data type, such as an integer, interval, timestamp, date, etc., to a string.

The CURRENT_TIME function retrieve the current time and the time zone. It can accept an optional parameter “precision” to set the precision of the retrieved fractional seconds.

In Postgres, a new table can be created via the SELECT command; for this, the CREATE TABLE statement is used along with an AS clause followed by a SELECT statement.

PostgreSQL provides a built-in ARRAY_PREPEND() function that is used to append an element at the start of an array. It accepts two arguments: an element and an array.

In Postgres, the UNION ALL operator combines the result sets of two or more queries into one table, including the duplicate records.

In Postgres, the ARRAY_LENGTH() is used to find the array's length. The ARRAY_LENGTH() function finds the array’s length based on the requested dimension.

If a VIEW to be dropped doesn’t exist, then Postgres throws a VIEW doesn’t exist error. To rectify this error, the “IF EXISTS” option is used with the DROP VIEW statement.