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{{Built-in|Key|⌸}} is a [[primitive operator|primitive]] [[monadic operator]] which takes a [[dyadic function]] [[operand]] where specified keys group the indices or major cells of an argument. It was introduced in [[Dyalog APL]] version 14.0 and is commonly compared to SQL's | {{Built-in|Key|⌸}} is a [[primitive operator|primitive]] [[monadic operator]] which takes a [[dyadic function]] [[operand]] where specified keys group the indices or major cells of an argument. It was introduced in [[Dyalog APL]] version 14.0 and is commonly compared to SQL's [[wikipedia:Group by (SQL)|GROUP BY]] statement. | ||
== Description == | == Description == |