what is aggregation funtion and where it is used...i am having confusion when to use sum or when to use aggregation..please explain with some 'exapmle'.....
The Aggr() is not an aggregation function. In principle, you should never use Aggr() - unless you have a good reason to, and can explain why. Most calculations can be made using standard aggregations: Sum(), Min(), Max(), Count() etc.
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