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SQL Optimizer for DB2 ZOS 5.6.1 - User 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.

 

UNIONA

Combine rows from multiple tables and retain duplicate rows.

An UNION ALL construct contains a UNIONA node and at least one subtree. Subtrees denote any source query blocks.

 

UPDATE

Modify rows in a table.

An update construct contains one UPDATE node and one of the following: single-index access, multiple-index access construct, or table space scan.

 

UPDCUR

Represents UPDATE WHERE CURRENT OF CURSOR value.

 

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