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

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 . None of these

C . Both of the above are helpful

D . EXISTS/NOT EXISTS expressions only

Answer: Option C

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Question 1. The process of reading a database schema and producing a data model from that schema is known as:....

Question 2. Before any changes to database structure are attempted one should first:....

Question 3. A regular subquery can be processed:....

Question 4. Which of the following modifications may not succeed?....

Question 5. How can you find rows that do not match some specified condition?....

Question 6. What SQL command can be used to add columns to a table?....

Question 7. The data model that is produced from reverse engineering is:....

Question 8. To drop a column that is used as a foreign key, first:....

Question 9. Changing cardinalities in a database is:....

Question 10. The NOT EXISTS keyword will be true if:....

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