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You have two tables named dbo.CurrentProducts and dbo.ArchiveProducts. You have the following query: SELECT ProductID, Name FROM dbo.CurrentProducts UNION ALL SELECT ProductID, Name FROM dbo.ArchiveProducts; You need to predict the list of products that the query will produce. Which list of products should the query return?Products that appear in dbo.CurrentProducts or dbo.ArchiveProducts.Products that appear in both tables are listed multiple times.Products that appear in dbo.CurrentProducts or dbo.ArchiveProducts but not in both.Products that appear in dbo.CurrentProducts or dbo.ArchiveProducts. Products that appear in both tables are listed only once.Products that have a matching ProductID and Name in dbo.CurrentProducts or dbo.ArchiveProducts.

Question

You have two tables named dbo.CurrentProducts and dbo.ArchiveProducts. You have the following query: SELECT ProductID, Name FROM dbo.CurrentProducts UNION ALL SELECT ProductID, Name FROM dbo.ArchiveProducts; You need to predict the list of products that the query will produce. Which list of products should the query return?Products that appear in dbo.CurrentProducts or dbo.ArchiveProducts.Products that appear in both tables are listed multiple times.Products that appear in dbo.CurrentProducts or dbo.ArchiveProducts but not in both.Products that appear in dbo.CurrentProducts or dbo.ArchiveProducts. Products that appear in both tables are listed only once.Products that have a matching ProductID and Name in dbo.CurrentProducts or dbo.ArchiveProducts.

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Solution

The query should return products that appear in dbo.CurrentProducts or dbo.ArchiveProducts. Products that appear in both tables are listed multiple times. This is because the UNION ALL operator combines the result set of two or more SELECT statements (without removing duplicate rows). Each SELECT statement within the UNION ALL must have the same number of columns. The columns must also have similar data types. Also, the columns in each SELECT statement must be in the same order.

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