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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) Recommended textbook solutions Computer Organization and Design MIPS Edition: The Hardware/Software Interface5th EditionDavid A. Patterson, John L. Hennessy 220 solutions
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Why is the data dictionary sometimes called the database designer's database?Explain why the data dictionary is sometimes called "the database designer's database." Because it contains metadata relating to the datatypes used and sizes as well has the relations in the database.
What does it mean to say that a database displays both entity integrity and referential integrity quizlet?Entity integrity in databases is a condition where the rows in all of the tables can be uniquely identified using the primary key of its corresponding table. Referential integrity in databases is a condition in which every reference to an entity instance by another entity instance is valid.
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Which relational algebra operators can be applied to a pair of tables that are not union-compatible?
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