Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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What is a table, and what role does it play in the relational model?
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- 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…arrow_forwardUse a suitable example to provide a thorough description of the relational model.arrow_forwardThe one-to-many relationship between two tables is made by including the primary key from one table into the other, thus making it a: (SELECT ONLY ONE ANSWER) A)Compound key B) Foreign key C) Important key D)Primary keyarrow_forward
- 25. In the relational model, relationships between relations or tables are created by using: a. composite keys b. determinants c. candidate keys d. foreign keysarrow_forwardPLz help with the following: Translate your ER diagram into a relational schema in the form of SQL DDLs. Choose appropriate data types for each attribute and include primary key and foreign key constraints, Check and Not Null constraints.arrow_forwardWhat are the performance implications of frequently using JOIN operations on large tables in databases?arrow_forward
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