guyren@xxxxxxxxxx schrieb am 02.12.2020 um 21:27:
The Halloween problem is that it is a challenge for the database if you’re updating a field that is also in the WHERE clause of the same query. I just saw a presentation from someone about how in SQL Server he recommended writing changes to a temp table and then writing them to the table as being much more efficient.
It sounds strange to me, that this _is_ actually a problem. Why exactly is that a problem in SQL Server? And what are the consequences if you do it nevertheless.
