Home/ Questions/Q 8793213
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-13T23:05:40+00:00

In my table I’ve a column MODIFIED with type TIMESTAMP. I want to update

  • 0

In my table I’ve a column MODIFIED with type TIMESTAMP.
I want to update this column automatically when the row is updated

I can use this for a new column 

alter table my_table add column last_updated timestamp not null
 generated by default for each row on update as row change timestamp

But I can’t use this to edit the existing column to do the updating automatically

alter table my_table alter column modified set data type timestamp 
 not null generated by default for each row on update as row change timestamp

Am I using the alter correctly?

the error message is 

Error: DB2 SQL Error: SQLCODE=-104, SQLSTATE=42601, SQLERRMC=alter table my_table alter column modified;BEGIN-OF-STATEMENT;<values>, DRIVER=3.50.152
SQLState:  42601
ErrorCode: -104
Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Found an article here
    http://ibmsystemsmag.blogs.com/db2utor/2008/01/automate-row-ch.html

    essentially it says

    • You cannot use the ALTER TABLE statement to convert a column on an
      existing table to use the as-row-change-timestamp-clause. You must
      either drop the table and recreate with the column defined with the
      as-row-change-timestamp-clause or ALTER the table and add a new
      column with the as-row-change-timestamp-clause.
    • 0