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On 02/22/07 19:04, Mark Walker wrote:
> I'm not sure what you're trying to do but, it appears that you database
> design is incorrect. What you need is something like
>
> CREATE TABLE temp_readings
> (
> _date Date,
> temperature double,
> source varchar(20),
> )
>
> No reading, no record. Are you suggesting that you would have a weekly
> set of records for each row?
But you still need NULL/UNKNOWN for outer joins.
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