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I have a table with those fields
Field 1 > ActivityID (PK, NOT NULL)
Field 2 > Alias (Unique) (NULL)
Field 3 > IsActive (NULL)
I want to do a logic delete by that I mean that I don’t want to delete the row.
I want to change the field IsActive to 0 and the field Alias to NULL
But my problem is that I can’t change the Alias Field to NULL because he is unique.
How can do a logic delete with Unique field, when I need to delete the value in the Unique field also.
If you’re using SQL 2008 & up, use a filtered index to not include NULL in the index.
SQL 2005 and earlier, Alias alone cannot have a unique constraint, be NULLable and be of much use. So, you can use the computed column technique to get around that. See this answer for more…
How to create a unique index on a NULL column?