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WGU C170 Data Management – Applications Questions and Answers Last Updated 2022

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WGU C170 Data Management – Applications Questions and Answers Last Updated 2022 domain ✔✔In data modeling, the construct used to organize and describe an attribute's set of possible values superkey ✔✔An attribute or ...

WGU C170 Data Management – Applications Questions and Answers Last Updated 2022 domain ✔✔In data modeling, the construct used to organize and describe an attribute's set of possible values superkey ✔✔An attribute or attributes that uniquely identify each entity in a table. Any composite key with this is also this. candidate key ✔✔A minimal superkey; that is, a key that does not contain a subset of attributes that is itself a superkey entity integrity ✔✔The property of a relational table that guarantees each entity has a unique value in a primary key and that the key has no null values referential integrity ✔✔A condition by which a dependent table's foreign key must have either a null entry or a matching entry in the related table data dictionary ✔✔A DBMS component that stores metadata. It contains the data definition & their characteristics and relationships; may also include data external to the DBMS system catalog ✔✔A detailed system data dictionary that describes all objects in a database homonym ✔✔The use of the same name to label different attributes, much like similar-sounding words with different meanings synonym ✔✔The use of different names to identify the same object, such as an entity, an attribute, or a relationship. These should generally be avoided. not null and unique ✔✔Any candidate key must have these two constraints enforced cardinality ✔✔Term for how many instances of one object are related to instances of another object (maximum) modality ✔✔Term for whether an instance of a specific entity is optional or mandatory in a relationship (minimum) connectivity ✔✔Term for the classification of the relationship between entities. Classifications include 1:1, 1:M, and M:N CREATE SCHEMA AUTHORIZATION ✔✔SQL command to create a database schema DEFAULT ✔✔SQL option to define a default value for a column (when no value is given) CHECK ✔✔SQL command to validate data in an attribute, used during table column creation CREATE TABLE AS ✔✔SQL command to create a new table based on a query in the user's database schema HAVING ✔✔SQL option that restrict

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