Question

I have a field urn_sem.studentid that I’d like to replace a few characters in; for example:

• ABC/2011/BCOMH_NC/I/12 → ABC/2011/BCOMH/I/12
• ABC/2011/BCOMH_NC/I/24 → ABC/2011/BCOMH/I/24

I’ve tried this query:

SELECT REPLACE(studentid, 'KNC/2011/BCOMH_NC/', ' KNC/2011/BCOMH/')
  FROM urn_sem

but it doesn’t show the new value.

Answer 1

Do you want this:

update urn_sem
    set studentid = REPLACE(studentid, 'KNC/2011/BCOMH_NC/', ' KNC/2011/BCOMH/')
    where studentid like '%KNC/2011/BCOMH_NC/%'

The WHERE clause is optional. It ensures that the replace is only on rows that change.