Which of the following SQL statements are helpful in database redesign? Options: A . &nbspCorrelated subqueries only B . &nbspEXISTS/NOT EXISTS expressions only C . &nbspBoth of the above are helpful D . &nbspNone of the above are helpful.

Which of the following SQL statements are helpful in database redesign?

Question

Which of the following SQL statements are helpful in database redesign?

Options:

A . Correlated subqueries only

B . EXISTS/NOT EXISTS expressions only

C . Both of the above are helpful

D . None of the above are helpful.

Answer: Option C

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Question 1. Database redesign is not terribly difficult if the:....

Question 2. The process of reading a database schema and producing a data model from that schema is known as:....

Question 3. Which of the following modifications may not succeed?....

Question 4. Which SQL-92 standard SQL command can be used to change a table name?....

Question 5. Before any changes to database structure are attempted one should first:....

Question 6. How can you find rows that do not match some specified condition?....

Question 7. . The EXISTS keyword will be true if:....

Question 8. . What SQL command can be used to add columns to a table?....

Question 9. A regular subquery can be processed:....

Question 10. . Changing cardinalities in a database is:....

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