When I'm trying to: select to_char("ISDate", 'DD.MM.YYYY')::text from register."KSPT_view" from table, containing nulls in "ISDate", i get nulls and formatted date as output.
But when I'm trying to: select to_char(null, 'DD.MM.YYYY')::text
I get a error message:
ERROR: function to_char(unknown, unknown) is not unique LINE 1: select to_char(null, 'DD.MM.YYYY')::text ^ HINT: Could not choose a best candidate function. You might need to add explicit type casts.
********** Error **********
ERROR: function to_char(unknown, unknown) is not unique SQL state: 42725 Hint: Could not choose a best candidate function. You might need to add explicit type casts. Character: 8
