How to automatically update the updated date column on updating row in RedShift?

Question

I have a table in Redshift which has an UpdatedDate column of type timestamp. The column is defined as

UpdatedDate timestamp DEFAULT getdate()

So when ever a new record is inserted the date is stored correctly in this column. The issue is in the update case. In update this column is not updated. What I need is for UpdatedDate column to update automatically when the data in the row is changed.

I know we can specify the column in the update query, but I do not have control over the query and cannot add the column there.

I tried using Triggers but Redshift does not seem to support them. Thanks for your time. Let me know if any other information is needed.

Answer 1

Create Staging table for this purpose. Refer Upsert in Redshift: https://docs.aws.amazon.com/redshift/latest/dg/merge-specify-a-column-list.html

During update statement, set update_ts = sysdate.