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Database Redesign
Dependency graphs are diagrams that consist of nodes and arcs that show the dependencies of a database.
True
False
Correct Answer:
True
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Database Redesign
The EXISTS keyword will be true if any row in the subquery meets the condition.
Correlated subqueries are similar to a regular subquery.
Because of the need for extensive knowledge of SQL, many database developers choose to automate the redesign process.
If a database is built correctly the first time, it will not have to be redesigned.
Database redesign is especially difficult if the database has no data.
The data model produced from the reverse engineering process is a true logical model.
A correlated subquery is processed as a nested subquery.
The SQL-92 command to change a table name is RENAME TABLE.
The use of the double NOT EXISTS can be used to find rows that do not match some specified condition.
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