Tag: databases

Questions Related to databases

which of these can be used to filter aggregate functions?
technology databases

  1. WHEN

  2. HAVING

  3. WHERE

  4. ANY

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Correct Option: B

REPLACE
technology databases

  1. Replaces word by word

  2. Replaces a column with another column

  3. Replaces character by character

  4. Replaces a row with another row

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Correct Option: A

How is IN different form EXISTS ?
technology databases

  1. IN executes the inner query for each row affected by the outer query and EXISTS executes the inner query only once irrespective of the outer query

  2. IN executes the inner query only once irrespective of the outer query and EXISTS executes the inner query only once irrespective of the outer query

  3. IN executes the inner query only once irrespective of the outer query and EXISTS executes the outer query for each row affected by the outer query

  4. IN executes the inner query for each row affected by the outer query and EXISTS executes the outer query for each row affected by the outer query

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Correct Option: C

Teradata components handle data distribution by
technology databases

  1. AMP bucket number

  2. Primary Index

  3. Primary Key

  4. None of the above

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Correct Option: B

_____ and _____ are true about the Primary Index
technology databases

  1. Defined immediately after the table CREATE statement, used to find the Primary Key

  2. Defined during the table CREATE statement, used to assign rows to an AMP

  3. Defined immediately after the table CREATE statement, used to assign rows to an AMP

  4. Defined during the table CREATE statement, used to find the Primary Key

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Correct Option: B

_____ and _____ are true about the Primary Index

technology databases

  1. Defined immediately after the table CREATE statement, used to assign rows to an AMP

  2. Defined immediately after the table CREATE statement, used to find the Primary Key

  3. Defined during the table CREATE statement, used to assign rows to an AMP

  4. Defined during the table CREATE statement, used to find the Primary Key

Show answer
Correct Option: C

AI Explanation

To answer this question, you need to understand the concept of Primary Index in database management systems. Let's go through each option to understand why it is correct or incorrect:

Option A) Defined immediately after the table CREATE statement, used to assign rows to an AMP - This option is incorrect because the Primary Index is not used to assign rows to an AMP. The Primary Index is used to distribute the data across AMPs (Access Module Processors) in a Teradata database.

Option B) Defined immediately after the table CREATE statement, used to find the Primary Key - This option is incorrect because the Primary Index is not used to find the Primary Key. The Primary Key is a constraint that ensures uniqueness of a column or set of columns in a table.

Option C) Defined during the table CREATE statement, used to assign rows to an AMP - This option is correct. The Primary Index is defined during the table CREATE statement and is used to assign rows to an AMP. It determines how the data is distributed across the AMPs for efficient parallel processing.

Option D) Defined during the table CREATE statement, used to find the Primary Key - This option is incorrect because the Primary Index is not used to find the Primary Key.

The correct answer is C) Defined during the table CREATE statement, used to assign rows to an AMP. This option is correct because the Primary Index is defined during the table CREATE statement and is used to assign rows to an AMP.

A new table has been created in the employee. There are no rows in the table.What would be the output of the following query?select count(*) from employee
technology databases

  1. Error

  2. 1

  3. No data Found

  4. 0

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Correct Option: D

Which of the query will print the output as 'TCS' (single quotes should come in the output of the query)

technology databases

  1. select '''||'TCS'||''' from dual

  2. select 'TCS' from dual

  3. select '''TCS''' from dual

  4. select "TCS" from dual

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Correct Option: A

What's the output select to_Date('2009-may-25','yyyymmdd') from dual

technology databases

  1. 2009-may-25

  2. Error

  3. may-2009-25

  4. 200925may

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Correct Option: B

Which of the query will print the output as 'TCS' (single quotes should come in the output)

technology databases

  1. select '''||'TCS ||''' from dual

  2. select '''TCS''' from dual

  3. select "TCS" from dual

  4. select 'TCS' from dual

Show answer
Correct Option: B