Question

I’m doing an INSERT INTO query in order to initialize a new table.
The primary key is RFQ_ID and Action_Time

How could add 1 millisecond to each Action_Time on a new record in order to avoid “Violation of PRIMARY KEY constraint”

INSERT INTO QSW_RFQ_Log
            (RFQ_ID, Action_Time, Quote_ID)
SELECT     RFQ_ID, GETDATE() AS Action_Time,  Quote_ID, 'Added to RFQ on Initialization' AS Note
FROM         QSW_Quote

Answer 1

I think the real problem is that RFQ_ID, Action_Time shouldn’t be a primary key. Create a surrogate primary key and put a non-unique index on RFQ_ID, Action_Time.

Update: If you really want to stick with your existing design you could do what you asked but using 10 milliseconds instead of one millisecond between each row, to compensate for the low precision of datetime. You can use the row number to determine how many milliseconds to add so that you get a different timestamp for each row:

INSERT INTO QSW_RFQ_Log
(RFQ_ID, Action_Time, Quote_ID, Note)
SELECT
  RFQ_ID,
  DATEADD(millisecond, 10 * ROW_NUMBER() OVER (ORDER BY Quote_ID), GETDATE()) AS Action_Time,
  Quote_ID,
  'Added to RFQ on Initialization' AS Note
FROM QSW_Quote