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I would like to know how RANGESUM() works and what would the result be for this: RANGESUM(1,2,'abc',NULL(),5)?
Please let me know.
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RangeSum() is not an aggregation function. It sums only individual numerical values that are listed as parameters to this call. There is no limit to the number of parameters you can specify.
In addition to the preceding, RangSum() will always return a value because invalid values (like text or NULL values) will all be treated as 0. That's the main and very useful difference with the + operator which fill return NULL as soon as even one operand proves to be invalid or NULL.