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Contributor II


in Qlikview development practices showed (a/b)-1 has better performance than (a-1)/b. why for these two equations equal number of operations are perform but it says (a/b)-1 was better. suggest me what is the reason

1 Reply

Re: optimization

I guess your second expression should be (a-b)/b

If a and b are complex expressions themselves, like aggregations,

the first expression (a/b)-1 only calculates two of these aggregations, while the second expression (a-b)/b calculates three (assuming no caching of b expression result involved, which is the case for Qlik AFAIK).

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