Ben is developing a health monitoring app to track user activities and vital signs. The app needs to handle three main types of data: USERS, ACTIVITIES, and VITALSWrite the DDL statements to create the following tables with the mentioned constraints to handle the data: symbol refers to the primary key NN refers to Not NULL After creating the tables, Ben needs to:Alter the USERS table to change the primary key to Email to ensure uniqueness based on email addresses.Drop the primary key from the ACTIVITIES table as it is no longer required.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.

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Solution

Sure, here are the DDL statements to create the tables:

CREATE TABLE USERS (
    UserID INT PRIMARY KEY,
    Name VARCHAR(255) NOT NULL,
    Email VARCHAR(255) NOT NULL
);

CREATE TABLE ACTIVITIES (
    ActivityID INT PRIMARY KEY,
    UserID INT NOT NULL,
    Activity VARCHAR(255) NOT NULL
);

CREATE TABLE VITALS (
    VitalID INT PRIMARY KEY,
    UserID INT NOT NULL,
    VitalType VARCHAR(255) NOT NULL,
    VitalValue FLOAT NOT NULL
);

To alter the USERS table to change the primary key to Email, you would first need to drop the existing primary key and then add a new one. Here's how you can do it:

ALTER TABLE USERS
DROP PRIMARY KEY,
ADD PRIMARY KEY (Email);

To drop the primary key from the ACTIVITIES table, you can use the following command:

ALTER TABLE ACTIVITIES
DROP PRIMARY KEY;

Please note that these commands are written for MySQL. The syntax might vary slightly depending on the database system you are using.

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Similar Questions

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