“SELECT” command: The “SELECT” command is used to retrieve data in a database . Syntax for selecting values from the table is as follows: SELECT STUDENT_ID FROM STUDENT; The given query is used to display each student ID from “STUDENT” table. “COUNT” function: It is the one function of aggregate function. The “COUNT” function is used to compute the number of rows in a table. Example: The example for “COUNT” function is given below: SELECT COUNT() FROM STUDENT WHERE MARK_CREDIT >= 90; The above query is used to display the number of students whose mark credit is greater or equal to “90” by using “COUNT” function. From the given query, the asterisk () represent any column. User can also count the number of rows in a query by selecting a particular column instead of using the asterisk. The below example is as follows SELECT COUNT(STUDENT_ID) FROM STUDENT WHERE MARK_CREDIT >= 90; “ORDER BY” Clause: User can sort the data in specific order using “ORDER BY” clause. The column on which to sort data is called a sort key or a simple key. To sort the output, use an “ORDER BY” clause followed by the sort key. If the user does not indicate a sort order, the output displayed in default order that is ascending order. Example: The example for “ORDER BY” clause is given below: SELECT STUDENT_ID, STUDENT_NAME, STUDENT_CREDIT FROM STUDENT ORDER BY STUDENT_CREDIT; The above query is used to list student ID, name and credit for each student with ascending order of student credit using an “ORDER BY” clause. From the given query, the sort key is “STUDENT_CREDIT”. So, the rows are sorted in ascending order by “STUDENT_CREDIT”. “GROUP BY” Clause: User can group the data using “GROUP BY” clause. This clause allows the user to group data on a specific column and then computes statistics when user preferred. Example: The example for “GROUP BY” clause is given below: SELECT CUSTOMER_NAME, SUM(AMOUNT) FROM CUSTOMERS GROUP BY CUSTOMER_NAME; The above query is used to list the customer name and the sum of amount using “GROUP BY” clause.

Question

1. Create a Person.java file. Implement the public Person and Student classes in Person.java, including all the variables and methods in the UMLS. Person -name: String -street: String -city: String +Person(String name, String, street, String, city) +getName(): String +setName(String name): void +getStreet(): String +setStreet(String street): void +getCity(): String +setCity(String City): void +toString(): String Student -Id: int +Person(String name, String, street, String, city, int Id) +getId(): int +setId(int Id): void +toString(): String 2. Create a StudentTest.java file. Implement a public StudentTest class with a main method. In the main method, create one student object and print the object using System.out.println(). Your printing result must follow the example output: name: Mike, street: Morris Ave, city: Union, Id: 1000 Hint: You need to modify the toString methods in the Student class and Person class!

Answer 1

Question

Chapter 4, Problem 8CAT

Program Plan Intro

“SELECT” command:

The “SELECT” command is used to retrieve data in a database.

Syntax for selecting values from the table is as follows:

SELECT STUDENT_ID FROM STUDENT;

The given query is used to display each student ID from “STUDENT” table.

“COUNT” function:

It is the one function of aggregate function.

The “COUNT” function is used to compute the number of rows in a table.

Example:

The example for “COUNT” function is given below:

SELECT COUNT() FROM STUDENT WHERE MARK_CREDIT >= 90;

The above query is used to display the number of students whose mark credit is greater or equal to “90” by using “COUNT” function.

From the given query, the asterisk () represent any column.

User can also count the number of rows in a query by selecting a particular column instead of using the asterisk.

The below example is as follows
SELECT COUNT(STUDENT_ID) FROM STUDENT WHERE MARK_CREDIT >= 90;

“ORDER BY” Clause:

User can sort the data in specific order using “ORDER BY” clause.

The column on which to sort data is called a sort key or a simple key.

To sort the output, use an “ORDER BY” clause followed by the sort key.

If the user does not indicate a sort order, the output displayed in default order that is ascending order.

Example:

The example for “ORDER BY” clause is given below:

SELECT STUDENT_ID, STUDENT_NAME, STUDENT_CREDIT FROM STUDENT ORDER BY STUDENT_CREDIT;

The above query is used to list student ID, name and credit for each student with ascending order of student credit using an “ORDER BY” clause.

From the given query, the sort key is “STUDENT_CREDIT”. So, the rows are sorted in ascending order by “STUDENT_CREDIT”.

“GROUP BY” Clause:

User can group the data using “GROUP BY” clause.

This clause allows the user to group data on a specific column and then computes statistics when user preferred.

Example:

The example for “GROUP BY” clause is given below:

SELECT CUSTOMER_NAME, SUM(AMOUNT) FROM CUSTOMERS GROUP BY CUSTOMER_NAME;

The above query is used to list the customer name and the sum of amount using “GROUP BY” clause.

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