How to detect records that have been deleted during a merge and find the surviving record?

Mon, 13 Mar 2017 16:12:01 +0000

When 2 records are merged, there is no clear trace of that merge, saying "this record has been deleted during the merge with THIS record".

The only solution I'm thinking about consists in looking at the sys_changed table.

So if I want to detect if a record has been merged into another one, my idea is to write a function that will search in sys_changed for a record updated by the same user at the same time (+/- 10seconds).

   CREATE FUNCTION [CUSTOM_MERGED_RECORD](@K_TABLE float, @KEY float)
RETURNS FLOAT AS 
BEGIN
    DECLARE @MERGED_KEY float;
    SELECT @MERGED_KEY = sc2.K_1
    FROM SYS_CHANGED sc
        inner join sys_changed sc2 
            on sc2.k_table = sc.k_table and sc2.USERNAME = sc.USERNAME 
            and sc2.K_1 != sc.K_1 and sc2.OPERATION = 'B' and sc2.K_2 = 0 and sc2.K_3 = 0
    WHERE 
        sc.OPERATION = 'D' and sc.K_TABLE = @K_TABLE AND sc.K_1 = @KEY
        and ABS(DATEDIFF(s, sc.D_CHANGE, sc2.d_change)) < 10

    RETURN @MERGED_KEY
END;

Is there a better solution?

Efficy Overflow Q&A - Recent questions tagged history-sys_changed-merge

How to detect records that have been deleted during a merge and find the surviving record?