SQL Optimizer for DB2 ZOS 5.6 - Installation Guide

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UNION

Combine rows from multiple tables and remove duplicate rows.

A UNION construct contains a UNION node and at least one subtree. Each subtree contains a WFSCAN node, a WORKFILE node, a SORT node, and the source query block node.

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SQL Optimizer for DB2 ZOS 5.6 - Installation Guide

UNION