Question: please can anyone help me with these questions? How do you indicate that a column alias should be used? i - oo When is it

please can anyone help me with these questions?

How do you indicate that a column alias should be used? i - oo When is it appropriate to use a column alias? What are the guidelines to keep in mind when using a column alias? How can you concantenate columns in a query? 10. What is a NULL value

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