Add primary key to existing table

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I have an existing table called Persion. In this table I have 5 columns:

  • persionId
  • Pname
  • PMid
  • Pdescription
  • Pamt

When I created this table, I set PersionId and Pname as the primary key.

I now want to include one more column in the primary key – PMID. How can I write an ALTER statement to do this? (I already have 1000 records in the table)

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