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The difference between Union and Union all is that Union all will not eliminate duplicate rows, instead it just pulls all the rows from all
The difference between Union and Union all is that Union all will not eliminate duplicate rows, instead it just pulls all the rows from all the tables fitting your query specifics and combines them into a table
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Introduction To Database And Knowledge Base Systems
Authors: S Krishna
1st Edition
9810206208, 978-9810206208
