Buradasın

Oracle PIVOT Clause Guide

Yapay zekadan makale özeti

Basic Concept: Oracle 11g introduced PIVOT clause for cross-tabulation queries
PIVOT transposes rows into columns while aggregating data
Output contains more columns and fewer rows than starting data
Syntax Components: Pivot_clause specifies columns to aggregate
Pivot_for_clause defines columns to group
Pivot_in_clause defines filter values
Implementation Examples: Example shows calculating order counts by product category and status
Multiple columns can be pivoted simultaneously
Subqueries cannot be used directly in pivot_in_clause
XML option allows using subqueries in pivot_in_clause
Column Naming: Pivot columns use convention: alias || '_' || pivot_clause alias
Multiple aggregate functions require aliases for at least one
XML output format shows aggregated data for each row