Error when creating a char column as primary key

Hi folks,

Complete novice here!

I am trying to create a table as;

CREATE TABLE table (serial_no VARCHAR[16] PRIMARY KEY, date date DEFAULT
current_date)

when I issue this command postgres returns an error saying;

ERROR: Can't find a default operator class for type 1015

I tried this as well;

CREATE TABLE table (serial_no VARCHAR[16] PRIMARY KEY NOT NULL, date date
DEFAULT current_date)

but I get the same error.

I guess that postgres is telling me that if there is no default value then
you can't assign a primary key to the column.

Is this the case or is there a work around that I can use without assigning
a SERIAL type to another column as the primary key?

Thanks,

greadey


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