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Advanced SQL
With the UNION clause, each query involved must output the same number of columns, and they must be UNION compatible.
True
Correct Answer:
True
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Advanced SQL
The most frequently used relational operation, which brings together data from two or more related tables into one resultant table, is called an equi-join.
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The UNION clause is used to combine the output from multiple queries together into a single result table.
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