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Questions and Answers
Which of the following is a rule of thumb when using INNER JOIN/ON in SQL?
Which of the following is a rule of thumb when using INNER JOIN/ON in SQL?
- Use one more INNER JOIN/ON combination than tables
- Use the same number of INNER JOIN/ON combinations as tables
- Use one less INNER JOIN/ON combination than tables (correct)
- Use as many INNER JOIN/ON combinations as needed
What is a self-join in SQL?
What is a self-join in SQL?
- When a table is joined with itself (correct)
- When a table is joined with an external data source
- When a table is joined with a subquery
- When two different tables are joined
What is the purpose of eliminating cases where a value would be equal to itself in a self-join?
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 (correct)
- To include all possible rows in the result set
- To avoid syntax errors
- To speed up the query execution
What is an example of using a self-join to find entities in the same geographic area?
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?
What is the reason for using the fully qualified name (FQN) in a self-join query?
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