Remove the foreign key constraint named fk_driver from the VEHICLES table.
Question
Remove the foreign key constraint named fk_driver from the VEHICLES table.
Solution
To remove the foreign key constraint named fk_driver from the VEHICLES table, you would use the ALTER TABLE statement in SQL. Here are the steps:
-
First, you need to know the name of the constraint. In this case, it's
fk_driver. -
Use the
ALTER TABLEstatement to drop the foreign key. The syntax is as follows:
ALTER TABLE table_name
DROP FOREIGN KEY constraint_name;
- Replace
table_namewith the name of your table, which isVEHICLES, andconstraint_namewith the name of your foreign key, which isfk_driver. The final SQL statement is:
ALTER TABLE VEHICLES
DROP FOREIGN KEY fk_driver;
- Run this SQL statement in your database management system.
Please note that you need to have the necessary privileges to alter a table. Also, make sure that no other tables depend on the foreign key you're trying to drop.
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Alexander is developing a ride-sharing application to track drivers, vehicles, and trips. The system needs to handle three main types of data: DRIVERS, VEHICLES, and TRIPS. Write the DDL statements to create the following tables with the mentioned constraints to handle the data: The DRIVERS table has a named primary key constraint pk_driver.The VEHICLES table has a named primary key constraint pk_vehicle for VehicleID and a named foreign key constraint fk_driver for DriverID.The TRIPS table has a named primary key constraint pk_trip for TripID and a named foreign key constraint fk_vehicle for VehicleID.symbol refers to the primary key NN refers to Not NULLAlexander ensures the following constraints are altered:Remove the foreign key constraint named fk_driver from the VEHICLES table.Note: The user must write only the query to create and alter the table. The query to display the description of the table is already given.Input format :No console inputOutput format :The output displays the successful table creation status, the structure of all three tables, and the existing foreign key constraint details.Refer to the sample output.Sample test cases :Input 1 :Output 1 :Table DRIVERS created.Table VEHICLES created.Table TRIPS created.Table VEHICLES altered. Name Null? Type ________________ ___________ ________________ DRIVERID NOT NULL NUMBER NAME NOT NULL VARCHAR2(100) LICENSENUMBER NOT NULL VARCHAR2(20) Name Null? Type ____________ ___________ _______________ VEHICLEID NOT NULL NUMBER DRIVERID NOT NULL NUMBER MAKE NOT NULL VARCHAR2(50) MODEL NOT NULL VARCHAR2(50) Name Null? Type ____________ ___________ _________ TRIPID NOT NULL NUMBER VEHICLEID NOT NULL NUMBER TRIPDATE NOT NULL DATE DISTANCE NOT NULL NUMBER TABLE_NAME FOREIGN_KEY_NAME FOREIGN_KEY_COLUMN REFERENCED_CONSTRAINT_NAME REFERENCED_TABLE_NAME REFERENCED_COLUMN_NAME _____________ ___________________ _____________________ _____________________________ ________________________ _________________________ TRIPS FK_VEHICLE VEHICLEID PK_VEHICLE VEHICLES VEHICLEID 1 row selected. Note :The program will be evaluated only after the “Submit Code” is clicked.Extra spaces and new line characters in the program output will result in the failure of the test case.
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