To combine multiple retrievals, which keyword is used to write several SELECT statements between them?

To combine multiple retrievals, which keyword is used to write several SELECT statements between them? Correct Answer UNION

The ‘UNION’ operator is used for combining the results of various ‘SELECT’ queries into one. For example, ‘SELECT a FROM table1 UNION SELECT a FROM table2;’ produces the results from tables table1 concatenated with that of table2.
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Related Questions

To combine multiple retrievals, we write several SELECT statements and put the keyword between them. What is the keyword?
S1: Always remember that regular and frequent practice is essential if you are to learn to write well.
P: Even with the most famous writers, inspiration is rare.
Q: Writing is 99 percent hard work and one percent inspiration, so the sooner you get into the habit of writing, the better.
R: It is no good waiting until you have an inspiration before you write.
S: You learn to write by writing.
S6: If you keep your eyes and ears open, you will find plenty of things to write about around you to be able to discipline yourself to write.

The Proper sequence should be:
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I: Some writing utensils don't write.
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The Proper sequence should be:
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