LEAD
Returns the row after the current one in the same result set without the need for a self-join. If there are no rows, this function returns NULL.
Syntax
LEAD(expression, [offset]) OVER ([PARTITION BY partition_expression] [ORDER BY order_expression]) → same as input type
expression: An expression that is returned.
offset: An optional parameter. The number of rows after the current row from which to obtain a value. Supports only a value of 1.
partition_expression: An optional expression that groups rows into partitions.
order_expression: An optional expression that specifies the order of the rows within each partition.
Examples
SELECT "Category",
"Descript",
"DayOfWeek",
LEAD(DayOfWeek, 1)
OVER (
PARTITION BY "Category"
ORDER BY "DayOfWeek")
FROM eth.recent_blocks
-- Category, Descript, DayOfWeek, EXPR$3
-- ARSON, ARSON, Friday, Friday
-- ARSON, ARSON OF A VEHICLE, Wednesday, null
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