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max_by aggregate function

  • Άρθρο

Applies to: check marked yes Databricks SQL check marked yes Databricks Runtime

Returns the value of an expr1 associated with the maximum value of expr2 in a group.

Syntax

max_by(expr1, expr2) [FILTER ( WHERE cond ) ]

This function can also be invoked as a window function using the OVER clause.

Arguments

  • expr1: An expression of any type.
  • expr2: An expression of a type that can be ordered.
  • cond: An optional boolean expression filtering the rows used for aggregation.

Returns

The result type matches the type of expr1.

This function is non-deterministic if expr2 is not unique within the group.

Examples

> SELECT max_by(x, y) FROM VALUES (('a', 10)), (('b', 50)), (('c', 20)) AS tab(x, y);
 b