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And likewise, few products reorder the execution based on table sizes. Consider this expression: (TABLE SmallTable1) UNION (TABLE BigTable) UNION (TABLE SmallTable2); It will probably merge SmallTable1 into BigTable, then merge SmallTable2 into that first result. com/oracle There are many reason that products lack UNION optimizations. First, UNIONs are not a common operation, so it is not worth the effort. And secondly, the order of execution becomes important if UNION and UNION ALL are mixed together: TABLE UNION TABLE UNION TABLE X Y ALL Z Is executed as (TABLE X UNION TABLE Y) UNION ALL TABLE Z and that is not the same as: TABLE X UNION (TABLE Y UNION ALL TABLE Z) Optimization of UNIONs is highly product-dependent, so you should experiment with it.
In good database model, each table has one and only one type of elements. That is, you don't have more than one Inventory table, more than one Personnel table, etc. com/oracle 31 But when the INCITS H2 (nee ANSI X3) Database Standards Committee added these operators, the model in the SQL-92 standard was to pair off the two tables on a row-per-row basis for set operations. (note: In SQL-92, we introduced the shorthand TABLE