Description: A union all view in SQL is a tool that allows combining the results of multiple queries into a single result table. Unlike the standard union operation, which removes duplicates, the union all view includes all records, even those that are identical. This means that if two or more rows from the combined tables have the same values, all of them will appear in the final result. This feature is particularly useful when it is necessary to retain the complete information from the involved tables, such as in data analysis where every entry counts. Union all views are defined using the UNION ALL clause in SQL and can include multiple tables or subqueries, providing flexibility in data manipulation. Additionally, being a view, it allows users to access combined data without the need to create a physical table, saving space and improving efficiency in database management. In summary, the union all view is a powerful tool for data consolidation in SQL, allowing analysts and developers to work with more complete and detailed datasets.
