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This is an article about how to skip null values to add index columns.
Use Case - There are scenarios where you will be required to find the first/last non null value in a row. For example, to answer the questions:
1. What was the first sales amount done by a sales person? - This means that you will have to find first non-null from 2017 to 2022. For example, for Greg this is 688.
2. What was the last sales amount done by a sales person - This means that you will have to find last non-null from 2017 to 2022. Hence for Laura, this is 753.
Of course, if more years are added in the beginning or end, the formula should support the flexibility of Power Query i.e. if more columns are added, the result should include those columns as well.