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Database Redesign
Reverse engineering is the process of reading a database schema and producing a data model from that schema.
True
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True
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Database Redesign
Typically, there should be at least two different copies of the database schema used in the redesign process.
Although creating test databases is a critical and necessary job, there are few career opportunities in this area.
A regular subquery is processed from the bottom up.
Dependency graphs are diagrams that consist of nodes and arcs that show the dependencies of a database.
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.
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