Martijn van Oosterhout wrote:
On Thu, Sep 27, 2007 at 02:48:52PM +0530, Anoo Sivadasan Pillai wrote:
Description :   I have two tables with the same data , While I issue an
update command to increment the value of a unique field by 1, the
statement fails in one table and will succeed in the other table.
Following is the script to reproduce the behaviour.

Correct. Unique constraints are not deferrable. I'm sure there are
people who would like it fixed, but there is currently not even a
proposal on how to do it. It's a hard problem, for which there are
well-known work-arounds. In practice this problem don't come up too

It's been on the TODO list for at least 5 years...

Wow, I was not aware of this limitation. MySQL hacks around this issue by allowing an ORDER BY in UPDATE (and DELETE) statements.


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