To check for more than one channel-per-record in the table:
select channel,count(*) as cnt from ChannelStatus group by channel having cnt>1
should return zero records if you have no dups.
On 9/29/05, Hal Vaughan <hal@stripped> wrote:
> I have a query like this:
> SELECT DISTINCT Channel, ChannelType, Source FROM ChannelStatus;
> Each channel is supposedly listed in this table only 1 time, but just in case,
> what I really want to do is make sure that no channels are duplicated. Is
> there some way to make the keyword "DISTINCT" apply to Channel only? Sort of
> a shortcut to (example in pseudocode, although it'd be in Perl):
> SELECT DISTINCT Channel FROM ChannelStatus;
> FOR EACH Channel
> SELECT Channel, ChannelType FROM Source WHERE Channel = 'channel'
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