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DATABASE REDESIGN

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

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

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Database Redesign
What SQL command can be used to delete columns from a table?

MODIFY TABLE TableName DROP ColumnName
ALTER TABLE TableName DROP ColumnName
MODIFY TABLE TableName DROP COLUMN ColumnName
ALTER TABLE TableName DROP COLUMN ColumnName

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Database Redesign
Database redesign is not terribly difficult if the:

database is structured.
database is relatively small.
database has no data.
database is well-designed.

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Database Redesign
Which SQL-92 standard SQL command can be used to change a table name?

CHANGE TABLE
ALTER TABLE
None of these
RENAME TABLE

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Database Redesign
The process of reading a database schema and producing a data model from that schema is known as:

reverse engineering.
None of these
database design.
data modeling.

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