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Use to perform a star join.
Star join allows you to join a dimension column of a fact table to the key column in the corresponding dimension table.
Use to read every row in a table.
A table space scan construct consists of two nodes: a TBSCAN node and some type of table node such as a base table, a materialized query table, a work file, a pipe, or a table function.
Denotes TRUNCATE statement.
A TRUNCATE statement deletes all rows for either declared global temporary tables or base tables.
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.