Tag: databases

Questions Related to databases

Which is not a group function?
technology databases

  1. Count

  2. Avg

  3. Total

  4. Max

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Correct Option: C

You can use Avg or Sum group functions for any numeric data
technology databases

  1. True

  2. False

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Correct Option: B

COUNT(DISTINCT expr) returns
technology databases

  1. No. of rows in a table

  2. No. of rows with non-null values of the expr

  3. No. of distinct non-null values of the expr

  4. None of the above

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Correct Option: C

Which function forces group functions to include null values?
technology databases

  1. Group By

  2. NVL

  3. Order By

  4. Having

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Correct Option: B

All columns in the SELECT list, that are not there in the GROUP function, should be in the Group By clause

technology databases

  1. True

  2. False

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Correct Option: B

Which is the clause used to restrict groups?
technology databases

  1. HAVING

  2. WHERE

  3. Order By

  4. Group by

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Correct Option: A

We can use Group functions in the WHERE clause
technology databases

  1. True

  2. False

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Correct Option: B

We can use MIN and MAX for any
technology databases

  1. Numeric data

  2. Data type

  3. Char data

  4. None of the Above

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Correct Option: A

We can nest Group Functions
technology databases

  1. True

  2. False

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Correct Option: B

Delete from Employee where grade = ‘Y’” deletes
technology databases

  1. All rows of the Employee table

  2. Rows of the Employee table where the set grade is ‘Y’

  3. Delete 1 row

  4. Nothing will be deleted

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Correct Option: B