PostgreSQL: ROUND makes the value 0.5 returned from a calculation to 0 instead of 1 - Solved

In PostgreSQL, things can look odd as the following queries show.

postgres=> select round(3/cast(6 as float));
 round
-------
     0

postgres=> select 3/cast(6 as float);
 ?column?
----------
      0.5

postgres=> select round(0.5);
 round
-------
     1

To make round(3/cast(6 as float)) to return 1 instead of 0, you need to put another layer of parenthesis to it.

postgres=> select round((3/cast(6 as numeric)));
 round
-------
     1

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