Create a function that updates the record with and timestamps

I would like to have postgres update the last_modified column with the current_date on an update of the record.

I am not sure if there is a very simple way of doing this?

Or, do I need to create a function and a trigger to call the row and update with new data and set the last_modified to current_date?

Here is the table.

CREATE TABLE price.price_table (
PRICE_DATE DATE,
ID VARCHAR(13),
OPENING NUMERIC(18,6),
CLOSING NUMERIC(18,6),
HIGHEST NUMERIC(18,6),
LOWEST NUMERIC(18,6),
VOLUME BIGINT,
LAST_MODIFIED TIMESTAMP(6) WITHOUT TIME ZONE DEFAULT current_date,
CONSTRAINT PK_PRICE PRIMARY KEY (PRICE_DATE,ID));

Any help would be appreciated.

Cheers,

Chris

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