Analysis of information sources in references of the Wikipedia article "Set operations (SQL)" in English language version.
UNION ALL views technique for managing maintenance and performance in your large data warehouse environment ... This UNION ALL technique has saved many of my clients with issues related to time-sensitive database designs. These databases usually have an extremely volatile current timeframe, month, or day portion and the older data is rarely updated. Using different container DASD allocations, tablespaces, tables, and index definitions, the settings can be tuned for the specific performance considerations for these different volatility levels and update frequency situations." Terabyte Data Warehouse Table Design Choices - Part 2 (accessed on July 25, 2006)EXCEPT DISTINCT table operator: Use MINUS instead of EXCEPT DISTINCT" "Oracle Compliance To Core SQL:2003". Docs.oracle.com. Retrieved 7 July 2022.