Andreas,
- Usage of varchar for key column
And? Varchar is somehow implicitly inferior for keys?
Watch it ... you're about to hit one of my "abuses of SQL" pet-peeves, the overuse on INT surrogate keys ...
You might be right for small dbs, but a temperature database will likely contain millions of rows, if filled in the real world. varchar will probably make the table several times bigger than needed.
Additionally, I regretted *every* case where I decided to use some text data as key, sooner or later.
Regards, Andreas
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