Unlock the full potential of Excel's SUM function with advanced techniques for data analysis, conditional counting, and more.

You can use SUMIF in Google Sheets to add numbers together that are associated with a date range, specific text, or meet a numeric criterion.

If customer_id 2 has 2 purchases it would be x+y.<BR><BR>But how would a function determine how many purchases to add, add the numbers, then go to the next customer_id?

SERIESSUM function returns the sum of a power series based on the formula. Learn how to use the SERIESSUM function in Excel.

You can sum a series of numbers in Microsoft Excel manually by typing in a simple formula, or automatically with a tool.