Which of the following is true of foreign keys? A foreign key should always be linked to a primary key of another table. O A foreign key is not needed if the data type is different. O A foreign key could be linked to a candidate key of a table. A foreign key can be linked to any foreign key.

Which of the following is true of foreign keys? A foreign key should always be linked to a primary key of another table. O A foreign key is not needed if the data type is different. O A foreign key could be linked to a candidate key of a table. A foreign key can be linked to any foreign key.

Database Systems: Design, Implementation, & Management

12th Edition

ISBN:9781305627482

Author:Carlos Coronel, Steven Morris

Publisher:Carlos Coronel, Steven Morris

Chapter3: The Relational Database Model

Section: Chapter Questions

Problem 19P: Do the tables exhibit referential integrity? Answer yes or no, and then explain your answer. Write...

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SQL Query

Structured Query Language is the full form of SQL. It is one of the standard languages to deal with the relational database. It is used to insert, update, delete, and search the records stored in a RDBMS. The relational databases are created and managed by using SQL.

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https://postgres.sophia.org/
Which of the following is true of foreign keys?
A foreign key should always be linked to a primary key of another table.
O A foreign key is not needed if the data type is different.
O A foreign key could be linked to a candidate key of a table.
O A foreign key can be linked to any foreign key.

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Do the tables exhibit referential integrity? Answer yes or no, and then explain your answer. Write NA (Not Applicable) if the table does not have a foreign key.
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Which of the following is true of foreign keys? A foreign key should always be linked to a primary key of another table. A foreign key could be linked to a candidate key of a table. A foreign key is not needed if the data type is different. A foreign key can be linked to any foreign key.
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1) Create a table with a COMPOSITE PRIMARY KEY (mininum 3 columns the table) and the second table will have will have a foreign keys to the PRIMARY KEY 2) Create a table in 1NF (mininum 5 columns the table). Then transform that table into as many tables as necessary to satisfy 2NF.Then transform that table into as many tables as necessary to satisfy 3NF
Create LessonSchedule table with FK constraints in mysql database Two tables are created: Horse with columns: ID - integer, primary key RegisteredName - variable-length string Student with columns: ID - integer, primary key FirstName - variable-length string LastName - variable-length string Create the LessonSchedule table with columns: HorseID - integer with range 0 to 65 thousand, not NULL, partial primary key, foreign key references Horse(ID) StudentID - integer with range 0 to 65 thousand, foreign key references Student(ID) LessonDateTime - date/time, not NULL, partial primary key If a row is deleted from Horse, the rows with the same horse ID should be deleted from LessonSchedule automatically. If a row is deleted from Student, the same student IDs should be set to NULL in LessonSchedule automatically.
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