On Dec 29, 2009, at 3:10 AM, muzy <p...@muzybot.de> wrote:
Hello Ben,
I had the same question yesterday (but with SQLite) and there are at
least 2 solutions.
The first was already mentioned:
UPDATE table SET value = value + 1 WHERE foo = bar;
The second solution which also works is:
UPDATE table SET value = (SELECT value FROM table WHERE foo = bar) +
1 WHERE foo = bar;
I hope it helps.
Greetings from Germany,
Sebastian
Ben Miller wrote:
I hope this isn't a bone-head question - Is there a MySQL query
that will
increment/decrement the value in an integer column with a single
query - in
other words, I don't have to run a SELECT query to get the value,
add/subtract to/from the value, and then run an UPDATE query to
store the
new value?
Thanks in advance.
Ben
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You may run into race conditions and contention when handling auto-
incrementimg this way. Best to isolate the SQL into a transaction to
avoid this
Bastien
Sent from my iPod
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