Updated: August 8th, 2010
Today I had to swap 2 columns in one of my MySQL tables. The task, which seems easily accomplishable by a temp variable, proved to be a bit harder to complete. But only just a bit.
Here are my findings:
-
The
UPDATE swap_test SET x=y, y=x;
approach doesn't work, as it'll just set both values to y.
PostgreSQL seems to handle this query differently, as it apparently uses the old values throughout the whole query. [Reference] -
Here's a method that uses a temporary variable. Thanks to Antony from the comments for the "IS NOT
…
Read the rest of this article »
beer planet is a blog about technology, programming, computers, and geek life. It is run by Artem Russakovskii - a local San Francisco geek who currently works at 
Artem loves commenting on other people's blogs and reading comments on his own, so go ahead and leave one.
