Question

2. The score recorded for student 12 for event 5 is incorrect. The score should be a 10. Make this change to the database table.

      a. What construct did you use? Insert the snip of your SQL code here:

      b. Display the contents of the score table for event 5. Be sure student 12 is displayed. Insert your snip here:

*************************************************************

DATABASE

************************************************************

#---Create and open the database

drop database if exists Class;

CREATE DATABASE Class;

#-- Using the database

USE Class;

# create student table

DROP TABLE IF EXISTS student;

CREATE TABLE student

(
  
name VARCHAR(20) NOT NULL,
  
gender ENUM('F','M') NOT NULL,
  
student_id INT UNSIGNED NOT NULL AUTO_INCREMENT,
  
PRIMARY KEY (student_id)

);

# create grade event table

DROP TABLE IF EXISTS grade_event;

CREATE TABLE grade_event

(
  
date DATE NOT NULL,
  
category ENUM('T','Q') NOT NULL,
  
event_id INT UNSIGNED NOT NULL AUTO_INCREMENT,
  
PRIMARY KEY (event_id)

);

# create score table

# The PRIMARY KEY comprises two columns to prevent any combination
# of event_id/student_id from appearing more than once.

DROP TABLE IF EXISTS score;

CREATE TABLE score

(
  
student_id INT UNSIGNED NOT NULL,
  
event_id INT UNSIGNED NOT NULL,
  
score INT NOT NULL,
  
PRIMARY KEY (event_id, student_id),
  
INDEX (student_id),
  
FOREIGN KEY (event_id) REFERENCES grade_event (event_id),
  
FOREIGN KEY (student_id) REFERENCES student (student_id)

);

# create absence table

DROP TABLE IF EXISTS absence;

CREATE TABLE absence

(
  
student_id INT UNSIGNED NOT NULL,
  
date DATE NOT NULL,
  
PRIMARY KEY (student_id, date),
  
FOREIGN KEY (student_id) REFERENCES student (student_id)

);

#--Populate the student table

INSERT INTO student VALUES ('Megan','F',NULL);

INSERT INTO student VALUES ('Joseph','M',NULL);

INSERT INTO student VALUES ('Kyle','M',NULL);

INSERT INTO student VALUES ('Katie','F',NULL);

INSERT INTO student VALUES ('Abby','F',NULL);

INSERT INTO student VALUES ('Nathan','M',NULL);

INSERT INTO student VALUES ('Liesl','F',NULL);

INSERT INTO student VALUES ('Ian','M',NULL);

INSERT INTO student VALUES ('Colin','M',NULL);

INSERT INTO student VALUES ('Peter','M',NULL);

INSERT INTO student VALUES ('Michael','M',NULL);

INSERT INTO student VALUES ('Thomas','M',NULL);

INSERT INTO student VALUES ('Devri','F',NULL);

INSERT INTO student VALUES ('Ben','M',NULL);

INSERT INTO student VALUES ('Aubrey','F',NULL);

INSERT INTO student VALUES ('Rebecca','F',NULL);

INSERT INTO student VALUES ('Will','M',NULL);

INSERT INTO student VALUES ('Max','M',NULL);

INSERT INTO student VALUES ('Rianne','F',NULL);

INSERT INTO student VALUES ('Avery','F',NULL);

INSERT INTO student VALUES ('Lauren','F',NULL);

INSERT INTO student VALUES ('Becca','F',NULL);

INSERT INTO student VALUES ('Gregory','M',NULL);

INSERT INTO student VALUES ('Sarah','F',NULL);

INSERT INTO student VALUES ('Robbie','M',NULL);

INSERT INTO student VALUES ('Keaton','M',NULL);

INSERT INTO student VALUES ('Carter','M',NULL);

INSERT INTO student VALUES ('Teddy','M',NULL);

INSERT INTO student VALUES ('Gabrielle','F',NULL);

INSERT INTO student VALUES ('Grace','F',NULL);

INSERT INTO student VALUES ('Emily','F',NULL);

INSERT INTO student VALUES ('Rachel','F',NULL);

#--Populate grade event table

INSERT INTO grade_event VALUES('2015-09-03', 'Q', NULL);
INSERT INTO grade_event VALUES('
2015-09-06', 'Q', NULL);
INSERT INTO grade_event VALUES('
2015-09-09', 'T', NULL);
INSERT INTO grade_event VALUES('
2015-09-16', 'Q', NULL);
INSERT INTO grade_event VALUES(
'2015-09-23', 'Q', NULL);
INSERT INTO grade_event VALUES('
2015-10-01', 'T', NULL);

#--Populate the score table

INSERT INTO score VALUES (1,1,20);

INSERT INTO score VALUES (3,1,20);

INSERT INTO score VALUES (4,1,18);

INSERT INTO score VALUES (5,1,13);

INSERT INTO score VALUES (6,1,18);

INSERT INTO score VALUES (7,1,14);

INSERT INTO score VALUES (8,1,14);

INSERT INTO score VALUES (9,1,11);

INSERT INTO score VALUES (10,1,19);

INSERT INTO score VALUES (11,1,18);

INSERT INTO score VALUES (12,1,19);

INSERT INTO score VALUES (14,1,11);

INSERT INTO score VALUES (15,1,20);

INSERT INTO score VALUES (16,1,18);

INSERT INTO score VALUES (17,1,9);

INSERT INTO score VALUES (18,1,20);

INSERT INTO score VALUES (19,1,9);

INSERT INTO score VALUES (20,1,9);

INSERT INTO score VALUES (21,1,13);

INSERT INTO score VALUES (22,1,13);

INSERT INTO score VALUES (23,1,16);

INSERT INTO score VALUES (24,1,11);

INSERT INTO score VALUES (25,1,19);

INSERT INTO score VALUES (26,1,10);

INSERT INTO score VALUES (27,1,15);

INSERT INTO score VALUES (28,1,15);

INSERT INTO score VALUES (29,1,19);

INSERT INTO score VALUES (30,1,17);

INSERT INTO score VALUES (31,1,11);

INSERT INTO score VALUES (1,2,17);

INSERT INTO score VALUES (2,2,8);

INSERT INTO score VALUES (3,2,13);

INSERT INTO score VALUES (4,2,13);

INSERT INTO score VALUES (5,2,17);

INSERT INTO score VALUES (6,2,13);

INSERT INTO score VALUES (7,2,17);

INSERT INTO score VALUES (8,2,8);

INSERT INTO score VALUES (9,2,19);

INSERT INTO score VALUES (10,2,18);

INSERT INTO score VALUES (11,2,15);

INSERT INTO score VALUES (12,2,19);

INSERT INTO score VALUES (13,2,18);

INSERT INTO score VALUES (14,2,18);

INSERT INTO score VALUES (15,2,16);

INSERT INTO score VALUES (16,2,9);

INSERT INTO score VALUES (17,2,13);

INSERT INTO score VALUES (18,2,9);

INSERT INTO score VALUES (19,2,11);

INSERT INTO score VALUES (21,2,12);

INSERT INTO score VALUES (22,2,10);

INSERT INTO score VALUES (23,2,17);
INSERT INTO score VALUES (24,2,19);

INSERT INTO score VALUES (25,2,10);

INSERT INTO score VALUES (26,2,18);

INSERT INTO score VALUES (27,2,8);

INSERT INTO score VALUES (28,2,13);

INSERT INTO score VALUES (29,2,16);

INSERT INTO score VALUES (30,2,12);

INSERT INTO score VALUES (31,2,19);

INSERT INTO score VALUES (1,3,88);

INSERT INTO score VALUES (2,3,84);

INSERT INTO score VALUES (3,3,69);

INSERT INTO score VALUES (4,3,71);

INSERT INTO score VALUES (5,3,97);

INSERT INTO score VALUES (6,3,83);

INSERT INTO score VALUES (7,3,88);
INSERT INTO score VALUES (8,3,75);

INSERT INTO score VALUES (9,3,83);

INSERT INTO score VALUES (10,3,72);
INSERT INTO score VALUES (11,3,74);

INSERT INTO score VALUES (12,3,77);

INSERT INTO score VALUES (13,3,67);
INSERT INTO score VALUES (14,3,68);

INSERT INTO score VALUES (15,3,75);

INSERT INTO score VALUES (16,3,60);

INSERT INTO score VALUES (17,3,79);

INSERT INTO score VALUES (18,3,96);

INSERT INTO score VALUES (19,3,79);

INSERT INTO score VALUES (20,3,76);

INSERT INTO score VALUES (21,3,91);

INSERT INTO score VALUES (22,3,81);

INSERT INTO score VALUES (23,3,81);

INSERT INTO score VALUES (24,3,62);

INSERT INTO score VALUES (25,3,79);

INSERT INTO score VALUES (26,3,86);

INSERT INTO score VALUES (27,3,90);

INSERT INTO score VALUES (28,3,68);

INSERT INTO score VALUES (29,3,66);

INSERT INTO score VALUES (30,3,79);

INSERT INTO score VALUES (31,3,81);

INSERT INTO score VALUES (2,4,7);

INSERT INTO score VALUES (3,4,17);

INSERT INTO score VALUES (4,4,16);

INSERT INTO score VALUES (5,4,20);

INSERT INTO score VALUES (6,4,9);

INSERT INTO score VALUES (7,4,19);

INSERT INTO score VALUES (8,4,12);

INSERT INTO score VALUES (9,4,17);

INSERT INTO score VALUES (10,4,12);

INSERT INTO score VALUES (11,4,16);

INSERT INTO score VALUES (12,4,13);

INSERT INTO score VALUES (13,4,8);

INSERT INTO score VALUES (14,4,11);

INSERT INTO score VALUES (15,4,10);

INSERT INTO score VALUES (16,4,20);

INSERT INTO score VALUES (18,4,11);

INSERT INTO score VALUES (19,4,15);

INSERT INTO score VALUES (20,4,17);

INSERT INTO score VALUES (21,4,13);

INSERT INTO score VALUES (22,4,20);

INSERT INTO score VALUES (23,4,13);

INSERT INTO score VALUES (24,4,12);
INSERT INTO score VALUES (25,4,10);

INSERT INTO score VALUES (26,4,15);

INSERT INTO score VALUES (28,4,17);

INSERT INTO score VALUES (30,4,11);

INSERT INTO score VALUES (31,4,19);

INSERT INTO score VALUES (1,5,15);

INSERT INTO score VALUES (2,5,12);

INSERT INTO score VALUES (3,5,11);

INSERT INTO score VALUES (5,5,13);

INSERT INTO score VALUES (6,5,18);

INSERT INTO score VALUES (7,5,14);

INSERT INTO score VALUES (8,5,18);

INSERT INTO score VALUES (9,5,13);

INSERT INTO score VALUES (10,5,14);

INSERT INTO score VALUES (11,5,18);

INSERT INTO score VALUES (12,5,8);

INSERT INTO score VALUES (13,5,8);

INSERT INTO score VALUES (14,5,16);

INSERT INTO score VALUES (15,5,13);

INSERT INTO score VALUES (16,5,15);

INSERT INTO score VALUES (17,5,11);

INSERT INTO score VALUES (18,5,18);

INSERT INTO score VALUES (19,5,18);
INSERT INTO score VALUES (20,5,14);

INSERT INTO score VALUES (21,5,17);

INSERT INTO score VALUES (22,5,17);

INSERT INTO score VALUES (23,5,15);

INSERT INTO score VALUES (25,5,14);

INSERT INTO score VALUES (26,5,8);

INSERT INTO score VALUES (28,5,20);

INSERT INTO score VALUES (29,5,16);

INSERT INTO score VALUES (31,5,9);

INSERT INTO score VALUES (1,6,100);

INSERT INTO score VALUES (2,6,91);

INSERT INTO score VALUES (3,6,94);

INSERT INTO score VALUES (4,6,74);

INSERT INTO score VALUES (5,6,97);

INSERT INTO score VALUES (6,6,89);

INSERT INTO score VALUES (7,6,76);

INSERT INTO score VALUES (8,6,65);

INSERT INTO score VALUES (9,6,73);

INSERT INTO score VALUES (10,6,63);

INSERT INTO score VALUES (11,6,98);

INSERT INTO score VALUES (12,6,75);

INSERT INTO score VALUES (14,6,77);

INSERT INTO score VALUES (15,6,62);

INSERT INTO score VALUES (16,6,98);

INSERT INTO score VALUES (17,6,94);

INSERT INTO score VALUES (18,6,94);

INSERT INTO score VALUES (19,6,74);
INSERT INTO score VALUES (20,6,62);

INSERT INTO score VALUES (21,6,73);

INSERT INTO score VALUES (22,6,95);

INSERT INTO score VALUES (24,6,68);

INSERT INTO score VALUES (25,6,85);

INSERT INTO score VALUES (26,6,91);
INSERT INTO score VALUES (27,6,70);

INSERT INTO score VALUES (28,6,77);

INSERT INTO score VALUES (29,6,66);

INSERT INTO score VALUES (30,6,68);

INSERT INTO score VALUES (31,6,76);

#--Populate the absence table

INSERT INTO `absence` VALUES (3,'2015-09-03');

INSERT INTO `absence` VALUES (5,'2015-09-03');

INSERT INTO `absence` VALUES (10,'2015-09-06');

INSERT INTO `absence` VALUES (10,'2015-09-09');

INSERT INTO `absence` VALUES (17,'2015-09-07');

INSERT INTO `absence` VALUES (20,'2015-09-07');

INSERT INTO `absence` VALUES (22,'2015-09-15');

Answer 1

Score table(below) before updating the score of student 12 in event 5

To update the score, we use the UPDATE construct which has the below syntax.

UPDATE table_name

SET column_1= value1,

column_2=value2,

....

WHERE condition;

1. Specify the table name in which a value needs to be changed/updated after the UPDATE construct.

2. Specify the column/columns and their corresponding new values after the SET keyword.

3. Specify the condition after the WHERE clause to apply the update to specific rows. The WHERE clause is optional. If we do not specify, the update will happen for all the rows.

Here is the snip of the construct used to change the value of score from 8 to 10 for student id 12 in event 5.

score table after updating the score value