guy...@icloud.com 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.
