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Comment: Published by Scroll Versions from space DEV and version next

D toc

 

Excerpt

Function returns the first non-missing value found in an array of columns.

The order of the columns listed in the function determines the order in which they are searched.

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derive type:single value: COALESCE([col1,col2,col3]) as: 'firstValue'

Output: Generates the firsValue column firstValue column, which contains the first non-missing detected in col1,   col2, or or col3 in that order. 

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derive type:single value: COALESCE([col_ref1,col_ref2, col_ref3] )

A reference to a single column does not require brackets. References to multiple columns must be passed to the function as an array of column names.

ArgumentRequired?Data TypeDescription
col_ref1YstringName of the first column to find the first non-missing value
col_ref2NstringName of the second column to find the first non-missing value
col_ref3NstringName of the third column to find the first non-missing value

D s lang notes

col_ref1, col_ref2, col_ref3

...

You are tracking multiple racers across multiple heats. Racers might sit out heats for various reasons. 

Source:

Here's the race data.

...

RacerHeat1Heat2Heat3firstTime
Racer X 38.2237.6138.22
Racer Y41.33 38.0441.33
Racer Z39.2739.0438.8539.27

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