Questions and Answers
Which of the following is a rule of thumb when using INNER JOIN/ON in SQL?
Use one less INNER JOIN/ON combination than tables
What is a self-join in SQL?
When a table is joined with itself
What is the purpose of eliminating cases where a value would be equal to itself in a self-join?
To avoid redundant rows in the result set
What is an example of using a self-join to find entities in the same geographic area?
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What is the reason for using the fully qualified name (FQN) in a self-join query?
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