Add primary key to existing table

0 votes

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

  • persionId
  • Pname
  • PMid
  • Pdescription
  • Pamt

PersionId and Pname were the primary keys I chose for this table when I was creating it.

I now want to add PMID as a new column to the primary key. How do I construct this in an ALTER statement? (The table already contains 1000 records.)

Can someone help me with this?

Sep 10, 2022 in Database by Kithuzzz
• 38,010 points
400 views

1 answer to this question.

0 votes

You have to drop constraint and recreate it:

alter table Persion drop CONSTRAINT <constraint_name>

alter table Persion add primary key (persionId,Pname,PMID)

Edit:

you can find the constraint name by using the query below:

select OBJECT_NAME(OBJECT_ID) AS NameofConstraint
FROM sys.objects
where OBJECT_NAME(parent_object_id)='Persion'
and type_desc LIKE '%CONSTRAINT'
answered Sep 12, 2022 by narikkadan
• 63,700 points

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