Which key exist a primary key in another table Foreign key Artificial key Stable key Composite key
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Which key exist a primary key in another table
- Foreign key
- Artificial key
- Stable key
- Composite key
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- What is the maximum number of columns you can define as a primary key when using the column-level approach to creating a table? a. 0 b. 1 c. 30 d. 255Which of the following fields also serves as a primary key in another table when two tables are joined together on that value? a. foreign key b. primary key c. turn key d. repeating group keyAn index is automatically created for a FOREIGN KEY constraint. Select one: a. True b. False
- Some rows of a User table are shown below: User ucode name phone scode 7 Alex 847 - 3902 UX 8 Tony 203 - 3902 PX 9 Charles BD 11 Mary 877 - 3333 BD Which of the following queries retrieves the rows where there is no phone? a. SELECT * FROM User WHERE phone IS NULL b. SELECT * FROM User WHERE phone = “ ” c. SELECT * FROM User WHERE phone NOT IS NULL d. SELECT * FROM User WHERE phone > 0in sql The CREATE TRIGGER statement is used to create the trigger. THE _____ clause specifies the table name on which the trigger is to be attached. The ______ specifies that this is an AFTER INSERT trigger. Select one: a. Both A and C b. For, insert c. for insert, on d. On, for insertWrite down 5 triggers. Triggers should be meaningful.
- A foreign key is the candidate key that is selected to identify tuples. True or False.Views: Create a view “customer_guangzhou”, it indicates the customers from the city “guangzhou”; Create a view “ordersum_goods”, it indicates the total quantity of the orders of each product (goods).SOSL Query: Create a SOSL Query in salesforce to find the test keyword in the whole organization. You can use the documentation for the reference.
- The Employee table has the following columns: ID - integer, primary key FirstName - variable-length string LastName - variable-length string ManagerID - integer Write a SELECT statement to show a list of all employees' first names and their managers' first names. List only employees that have a manager. Order the results by Employee first name. Use aliases to give the result columns distinctly different names, like "Employee" and "Manager". Hint: Join the Employee table to itself using INNER JOIN.plz help in sql You can modify data in a view if the view contains a group function Select one: True FalseTwo 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, foreign key references Horse(ID) StudentID - integer with range 0 to 65 thousand, foreign key references Student(ID) LessonDateTime - date/time, not NULL Primary key is (HorseID, LessonDateTime) 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. Notes: Table and column names are case sensitive in the auto-grader. Your SQL code does not display any results in Develop mode. Use Submit mode to test your code.