SQL Server Hosting – Easy to Add Primary Key to Existing Table!

SQL Server Hosting

SQL Server is a relational database management system (RDBMS) from Microsoft that’s designed for the enterprise environment. SQL Server runs on T-SQL (Transact -SQL), a set of programming extensions from Sybase and Microsoft that add several features to standard SQL, including transaction control, exception and error handling, row processing, and declared variables.

Easy to Add Primary Key to Existing Table!

You can define a primary key in SQL Server 2016 by using SQL Server Management Studio or Transact-SQL. Creating a primary key automatically creates a corresponding unique, clustered or nonclustered index.

I have an existing table referred to as Persion. in this table I actually have five columns:

  • persionId
  • Pname
  • PMid
  • Pdescription
  • Pamt

When I created this table, I set PersionId and Pname because the primary key. I now wish to include an extra column within the primary key – PMID. however can i write an ALTER statement to try and do this? (I already have 1000 records in the table). First, you can drop constraint and recreate it with the following code:

You can find the constraint name by using the code below:

I think something like this should work

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