Question

In: Computer Science

Create a table book_store with columns Book_id VARCHAR(255) NOT NULL, Book_Name VARCHAR(255) NOT NULL, Book_genre VARCHAR(255)...

Create a table book_store with columns Book_id VARCHAR(255) NOT NULL,

Book_Name VARCHAR(255) NOT NULL,

Book_genre VARCHAR(255) NOT NULL,

Status VARCHAR(255) NOT NULL,

PRIMARY KEY (Book_id)

Create a table book with columns Book_id VARCHAR(255) NOT NULL,

Book_Name VARCHAR(255) NOT NULL,

Book_release integer,

Book_price integer ,

Publisher Varchar(10),

Book_genre VARCHAR(255) NOT NULL,

PRIMARY KEY (Book_id)

CREATE TABLE price_logs with columns id INT(11) NOT NULL AUTO_INCREMENT,

Book_id VARCHAR(255) NOT NULL,

Old_Book_price DOUBLE NOT NULL,

New_Book_price DOUBLE NOT NULL,

updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,

updated_by varchar(30) NOT NULL,

PRIMARY KEY (id),

KEY Book (Book_id),

CONSTRAINT price_logs_ibfk_1 FOREIGN KEY (Book_id) REFERENCES Book (Book_id) ON DELETE CASCADE ON UPDATE CASCADE

Update Trigger: Create a trigger to record/insert the price in price_logs table before updating the book table . Also record the user who updated the price.

Solutions

Expert Solution

Hello, Student below is your sql queries to your questions, Please make sure to like my work, it really motivates me.

1) Create a table book_store:-

CREATE TABLE book_store(


Book_id VARCHAR(255) NOT NULL,

Book_Name VARCHAR(255) NOT NULL,

Book_genre VARCHAR(255) NOT NULL,

Status VARCHAR(255) NOT NULL,

PRIMARY KEY (Book_id)

);

2)

CREATE TABLE book(

Book_id VARCHAR(255) NOT NULL,

Book_Name VARCHAR(255) NOT NULL,

Book_release integer,

Book_price integer ,

Publisher Varchar(10),

Book_genre VARCHAR(255) NOT NULL,

PRIMARY KEY (Book_id)

);

3)CREATE TABLE price_logs:-

CREATE TABLE price_logs(

id INT(11) NOT NULL AUTO_INCREMENT,

Book_id VARCHAR(255) NOT NULL,

Old_Book_price DOUBLE NOT NULL,

New_Book_price DOUBLE NOT NULL,

updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,

updated_by varchar(30) NOT NULL,

PRIMARY KEY (id),

KEY Book (Book_id),

CONSTRAINT price_logs_ibfk_1 FOREIGN KEY (Book_id) REFERENCES Book (Book_id) ON DELETE CASCADE ON UPDATE CASCADE

);

Update Trigger:

CREATE TRIGGER price_logs_trigger

BEFORE INSERT

ON price_logs FOR EACH ROW

BEGIN

  DECLARE uUser varchar(50)

SELECT USER( ) INTO uUser;

END;

Again, Please do not forget to like my work>3

Thank you!!


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