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Hi I read in some QlikView documentation that:
date(max(ORDERDATE,'DD/MM/YYYY')) is 3 times faster than
max(date(ORDERDATE,’DD/MM/YYYY’) )
Can anyone please tell me why? This is better? There was no explanation when I read it at the time.
It is due to the fact that the aggregation is done directly on a field. And then the Date() function is performed once at the end of the aggregation.
The second expression is an aggregation that needs to perform the function Date() on a field during aggregation. This slows it down - naturally.
