Returns the row before the current one in a partition based on the
ORDER BY clause without the need for a self-join. If there are no rows, this function returns
LAG(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 before 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.
SELECT "Category", "Descript", "DayOfWeek", LAG(DayOfWeek, 1) OVER ( PARTITION BY "Category" ORDER BY "DayOfWeek") FROM Samples."samples.dremio.com"."SF_incidents2016.json" -- Category, Descript, DayOfWeek, EXPR$3 -- ARSON, ARSON, Friday, null -- ARSON, ARSON, Friday, Friday
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