Duplicate Key Violates Unique Contraint when Updating a table

Hi all,

I am experiencing thgis problem since this morning. I seldom heard about
unique key constraint violation to happen when updating a table.

It happens to 1 or few records at early stage, but then to all.

My updating command is as following:

update mytable set my_status='Y' where myid='ABC123567778';

Can anyone help? All helps and solutions are appreciated.

THanks.

CK

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