what is the function of union operation
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The union operation combines the results of two different queries which have the same set of attributes in the select clause. It automatically eliminates duplicates.
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The union operation joins the results of two queries with the same set of characteristics in the select clause. Duplicates are automatically removed.
About function of union operation :
- The union operation joins the results of two queries with the same set of characteristics in the select clause. Duplicates are automatically removed.
- It combines the outcomes of two separate queries with the same set of characteristics in the select clause.
- The UNION operator joins the results from the two or more SELECT queries to avoid duplicate rows. They do not have to be the same length, though.
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