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Misy 5335
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Misy 5335
Why Use a Database? - Answer-A database is used to help people keep track of things, and the most
commonly used type of database is the relational database, although nonrelational databases (which are
used extensively in online applications such as Facebook and Twitter) are now also widely used.
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misy 5335 Why Use a Database? - Answer -A database is used to help people keep track of things, and the most commonly used type of database is the relational database, although nonrelational databases (which are used extensively in online applications such as Faceboo k and Twitter) are now also widely used. What are the Problems with Using Lists? - Answer -making changes to this list causes ...modification problems.. Modification problem - Answer -A situation that exists when the storing of one row in a table records facts about two themes or the deletion of a row removes facts about two themes, or when a data change must be made in multiple rows for consistency. null values - Answer -means a missing value. Are always problematic and that we want to avoid them whenever possible. relational model - Answer -A data model in which data are stored in relations and relationships between rows are represented by data values. relational database - Answer -contains a collection of separate tables table - Answer -holds data about one and only one theme in most circumstances. row - Answer -has data about a particular occurrence or instance of the thing of interest...A group of columns in a table. All the columns in a row pertain to the same entity. Also known as tuple or record. instance - Answer -A specific occurrence of an object of interest. Record - Answer -(1) A group of fields pertaining to the same entity; used in file -processing systems. (2) In the relational model, a synonym for row and tuple. column - Answer -stores a characteristic common to all rows...A logical group of bytes in a row of a relation or a table. The meaning of a column is the same for every row of the relation, and represents an attribute of a relation. Field - Answer -The central table in a dimensional database. Its attributes are called measures. See also measure. ...(1) A logical group of bytes in a record used with file processing. (2) In the context of the relational model, a synonym for attribute. modification actions - Answer -insert, update, and delete...An action that changes the value of a data item. Structured Query Language (SQL) - Answer -international standard, emerged as the leading technique for data definition and manipulation. Using SQL, you can? - Answer -reconstruct lists from their underlying tables; you can query for specific data conditions; you can perform computations on data in tables; and you can insert, update, and delete data. What is a Database System? - Answer -a database system has four components: users, the database application, the database management system (DBMS), and the database. database - Answer -is a collection of related tables and other structures - Answer - database management system (DBMS) - Answer -.is a computer program used to create, process, and administer the database .receives requests encoded in SQL and translates those requests into actions on the database .a large, complicated program that is licensed from a software vendor; companies almost never write their own DBMS programs.
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