The this_year() function determines the first day of the year in the specified date.
You can also determine the first day of the year value by using the IBM® Netezza® date_trunc() function.
The this_year() function has the following syntax:
date = this_year(date input);
The input value specifies a date.
Returns a date value that represents the first day of the year specified by input. For example:
select this_year('1996-2-29');
THIS_YEAR
------------
1996-01-01
(1 row)