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Database Redesign

Database Redesign
Reverse engineering is the process of reading a database schema and producing a data model from that schema.

True
False

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Database Redesign
A regular subquery can be processed:

from the top down.
by nesting.
from the bottom up.
None of these

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Database Redesign
How can you find rows that do not match some specified condition?

None of these
Double use of NOT EXISTS
EXISTS
NOT EXISTS

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Database Redesign
Which of the following modifications may not succeed?

Neither of the above actions will succeed
Both of the above actions should succeed
Changing a column data type from char to date
Changing a column data type from numeric to char

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Database Redesign
It is not easy to build a database correctly the first time.

False
True

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

EXISTS/NOT EXISTS expressions only
Correlated subqueries only
None of these
Both of the above are helpful

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