Problem description & analysis:
In the Excel table below, the 1st column contains sequence numbers and the 2nd column has duplicate values.
Task: Record the value appearing for the first time in the 2nd column and replace its duplicates with the string “cont.”.
Solution:
Use SPL XLL to enter the following formula:
=spl("=((d=E(?))d.group@1(Date)).(Date=$[cont.]),d",A1:B8)
As shown in the picture below:
Explanation:
E() function converts the data range to a two-dimensional table. group@1 groups rows and retrieves the 1st row of each group. The operator finds the difference of two sets.
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