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[Source] The use of union all in Oracle

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Posted on 2/16/2017 1:45:21 PM | | | |

The purpose of the UNION directive is to merge the results of two SQL statements, so that you can view the results of the query you want.

Note: In union usage, the field types of the two select statements match and the number of fields must be the same

If I want to query two tables, and the structure of the two tables is different, can I use union all???

Actually, of course!!!

The SQL statement is as follows:






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