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What is the difference between Union and Union All Operator in SQL Server - TSQL Tutorial 9 лет назад


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What is the difference between Union and Union All Operator in SQL Server - TSQL Tutorial

"Union" and "Union All" Operators combine the result set of two or more queries. The operators can be only applied to the result sets which return same number of columns as well the data types for the columns match. As both Operators (Union and Union All ) combines the result sets, but there is a small difference between them Union returns the distinct records from result sets. Union All returns everything from results sets. Blog post link for the video with scripts http://sqlage.blogspot.com/2014/08/ts...

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