http://monsoonwok.com/key-drops/
Key Drops
To remove the key from a combination of keys composed in MS SQL?
I am using MySQL DB and I have a table where there are three columns that are the key composed – user_id, content_id and group_id. Of these, I would like to drop only the group_id of the composite key and keep the other 2. How I can do? What is the safest way to do this? Please advice. Thanks
Key Drop (ALTER TABLE DROP CONSTRAINT). Create new keys on two columns (ALTER TABLE ADD constraint).
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