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Last tested: Nov 2, 2018
There are several methods mostly using the first_value() window function, so results may vary based on your SQL dialect.
If your result set is less than 5000 rows, this Table Calculation pattern will work:
To find the first non-null record in column orders.count:
max(
if(
row()=min(match(${orders.count}, ${orders.count})),
${orders.count}, 0))
More details on this article.
This content is subject to limited support.