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Hi there. Sorry for taking too long to respond. The "r" is an alias for the subquery "(select @rownum := 0)", which initializes variable @rownum to 0, which is the same as "set @rownum = 0".
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Weather Observation Station 20
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Hi there. Sorry for taking too long to respond. The "r" is an alias for the subquery "(select @rownum := 0)", which initializes variable @rownum to 0, which is the same as "set @rownum = 0".