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Questions and Answers
What does the keyword DISTINCT do in SQL?
What does the keyword DISTINCT do in SQL?
- It selects all rows from a table
- It sorts the data in ascending order
- It allows us to remove duplicates from the results (correct)
- It retrieves only certain columns of a table
What does the DISTINCT keyword do in SQL?
What does the DISTINCT keyword do in SQL?
- It sorts the results in ascending order
- It retrieves all columns from a table
- It removes duplicates from the results (correct)
- It retrieves only certain columns from a table
What is the concatenation operator in Oracle?
What is the concatenation operator in Oracle?
- /
- *
- +
- || (correct)
What is the maximum number of columns that can be sorted using the ORDER BY clause?
What is the maximum number of columns that can be sorted using the ORDER BY clause?
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What is the maximum number of columns that can be sorted using the ORDER BY clause?
What is the maximum number of columns that can be sorted using the ORDER BY clause?
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What is the purpose of using a column alias in Oracle?
What is the purpose of using a column alias in Oracle?
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How do you retrieve only certain columns from a table in SQL?
How do you retrieve only certain columns from a table in SQL?
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What is the order of mathematical operations in Oracle?
What is the order of mathematical operations in Oracle?
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What is an example of an Ordinal Sort in SQL?
What is an example of an Ordinal Sort in SQL?
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