A table in third normal form is one which: A Has only one primary key. B Is linked to another table by means of a foreign key. C Have no repeating fields. - D Contains no non-key dependencies C
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- A table in third normal form is one which: A Has only one primary key. B Is linked to another table by means of a foreign key. C Have no repeating fields. - D Contains no non-key dependencies C15. A table is said to exhibit referential integrity if: a. it has no foreign key. b. it has a foreign key, and all the foreign key values are unique and not null. c. it has a foreign key, and all the foreign key values are referenced in another table's primary key attribute. d. it has a foreign key, which is also a component of its primary key.What is a key feature of fifth normal form? A key step in this normal form has every determinant in a table as a candidate key. Foreign keys are created in this normal form. This normal form has the tables broken down into as many tables as possible to avoid redundancy. This normal form resolves any multivalued dependencies.
- What are Inconsistent key structures?Second normal form (2NF) states which of the following? All fields must contain single values only. Part of the primary key may not determine a non-key field. A non-key field may not determine a non-key field. In an all-key table, part of the key can determine multiple values of, at most, one other field.A Parent-Child connection exists between two tables when one holds the primary key of the other as an attribute. Tables are connected B-to-many. C Network-like tables. D The tables are linked like one-to-many.
- Implement a new independent entity phone in the Sakila database. Attributes and relationships are shown in the following diagram: The diagram uses Sakila naming conventions. Follow the Sakila conventions for your table and column names: All lower case Underscore separator between root and suffix Foreign keys have the same name as referenced primary key Write CREATE TABLE and ALTER TABLE statements that: Implement the entity as a new phone table. Implement the has relationships as foreign keys in the Sakila customer, staff, and store tables. Remove the existing phone column from the Sakila address table. Step 2 requires adding a foreign key constraint to an existing table. Ex: ALTER TABLE customer ADD FOREIGN KEY (phone_id) REFERENCES phone(phone_id) ON DELETE SET NULL ON UPDATE CASCADE; Specify data types as follows: phone_id, phone_number, and country_code have data type INT. phone_type has date type VARCHAR(12) and contains strings like 'Home', 'Mobile', and 'Other'. Apply…Implement a new independent entity phone in the Sakila database. Attributes and relationships are shown in the following diagram: The diagram uses Sakila naming conventions. Follow the Sakila conventions for your table and column names: All lower case Underscore separator between root and suffix Foreign keys have the same name as referenced primary key Write CREATE TABLE and ALTER TABLE statements that: Implement the entity as a new phone table. Implement the has relationships as foreign keys in the Sakila customer, staff, and store tables. Remove the existing phone column from the Sakila address table. Step 2 requires adding a foreign key constraint to an existing table. Ex: ALTER TABLE customer ADD FOREIGN KEY (phone_id) REFERENCES phone(phone_id) ON DELETE SET NULL ON UPDATE CASCADE; Specify data types as follows: phone_id, phone_number, and country_code have data type INT. phone_type has date type VARCHAR(12) and contains strings like 'Home', 'Mobile', and 'Other'. Apply…Consider R1(A, B, C, D) with the above functional dependencies. What would be a candidate key for R1?
- The meaning of the word "transitive" We know that tables in second normal form can be changed to tables in third normal form, but what is the rule for making this transformation?Implement a new independent entity phone in the Sakila database. Attributes and relationships are shown in the diagram below The diagram uses Sakila naming conventions. Follow the Sakila conventions for your table and column names: All lower case Underscore separator between root and suffix Foreign keys have the same name as referenced primary key Write CREATE TABLE and ALTER TABLE statements that: Implement the entity as a new phone table. Implement the has relationships as foreign keys in the Sakila customer, staff, and store tables. Remove the existing phone column from the Sakila address table. Step 2 requires adding a foreign key constraint to an existing table. Ex: ALTER TABLE customer ADD FOREIGN KEY (phone_id) REFERENCES phone(phone_id) ON DELETE SET NULL ON UPDATE CASCADE; Specify data types as follows: phone_id, phone_number, and country_code have data type INT. phone_type has date type VARCHAR(12) and contains strings like 'Home', 'Mobile', and 'Other'. Apply these…Please write in plain text format. Please dont copy the one that is already done! 1. ( For the Cities database, discuss one problem with either thecorrectness of the data or what can be easily done with the data that mightoccur if each of the following changes were made:• The state attribute of the City table was allowed to be null• The County table was merged into the State table by removing the Countytable and including a counties column in the State table with the names ofthe counties, plus a websites column in the State table with the websitesfor each county. The county column of the City table would just be thename of the county.2. Normalization The total set of five attributes is: {name, state, district, bill, vote}. This is forvotes of members of the House of Representatives on the bills that come up for avote. The functional dependencies that hold are:◦ {name} → {state, district}◦ {billNum, name} → {vote}• Now convert the above into Third Normal Form. Indicate all primary…
