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Terms in this set (7)
What is the difference between a database and a table?
...
What does it mean to say that a database displays both entity integrity and referential integrity?***
Means when data is displaying all the fields
Why are entity integrity and referential integrity important in a database?
Entity integrity and referential integrity are two forms of data integrity that are particularly important in relational databases. Relational databases break the storage of data down into elements that usually have to be joined back together again in order to produce meaningful results. Without guarantees of these two types of integrity, data would get dropped or duplicated.
What are the requirements that two relations must satisfy in order to be considered union-compatible?
Both must have the same number of attributes (columns) and corresponding attributes (columns) must have the same (or compatible) domains (data types).
Which relational algebra operators can be applied to a pair of tables that are not union-compatible?
SELECT, PROJECT, DIVIDE, PRODUCT, and JOIN
Explain why the data dictionary is sometimes called "the database designer's database."
because it records the design decisions about tables and their structures
A database user manually notes that "The file contains two hundred records, each record containing nine fields." Use appropriate relational database terminology to "translate" that statement.****
The relation has 9 tributes and 200 Tuples in the relation (table)
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