Pierre Leclerc Wrote:
...

When you discover the SUMPRODUCT formula, you can forget about COUNTIF
and SUMIF.

...

That's non-sense. Whenever a single condition involved, one should
invoke CountIf for counting and SumIf for summing. Moreover, if
efficiency (speed) is a concern, one should try to reduce 2 or more
conditions to a single condition by concatenating them and invoke a
CountIf or SumIf formula or a SumProduct or an array formula using
Count or Sum with a lesser number of conditionals.

Also when you discover INDEX/MATCH you can replace VLOOKUP, HLOOKUP
and LOOKUP.
...

The generality of INDEX/MATCH is no reason to dispense with VLOOKUP and
HLOOKUP. And there are classes of lookup problems Index/Match cannot
solve, but LOOKUP can.


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Aladin Akyurek
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