Chris May

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Last night I had another instance where doing a:

SELECT * FROM
TBL WHERE ID NOT IN (SELECT ID FROM TBL2)

would fail every time to return any rows.

After longer than it should have been, I realized that it was this stupid issue that I blogged about already (SQL "NOT IN" Will Fail If The List Contains A Null).

Here is a link to an article discussing the ways you can reload google adsense ads when the user is doing something AJAXey, or really, whenever.

I wonder though if google allows this type of thing in their terms.  You couldn't refresh the ad every 2 seconds, so why would they let you refresh the ad ever?  How could you define when you could and couldn't refresh an ad?