“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. Subquery: Subquery means one query is placed inside with another query. The inner query is called a subquery. The subquery is calculated first. After the subquery has been determined and the outer query can apply the results of the subquery. Example: The example for subquery is given below: SELECT ORDER_NUMBER FROM ORDER_LINE WHERE BOOK_NUMBER IN(SELECT BOOK_NUMBER FROM BOOKS WHERE CATEGORY = 'CE'); The above query is used to list the order number using subquery. From the given query, the subquery is “(SELECT BOOK_NUMBER FROM BOOKS WHERE CATEGORY = 'CE')”. The subquery is computed first and then outer query is computed. The outer query retrieves the order number on every row in the “ORDER_LINE” table for which the book number is in the results of the subquery. Because that table contains only the book numbers in category “CE”, the results display the preferred list of order numbers. “MIN” function: It is the one function of aggregate function. The “MIN” function is used to compute the minimum value in a column. Example: The example for “MIN” function is given below: SELECT MIN(MARK_CREDIT) FROM STUDENT; The above query is used to display the minimum mark credit from “STUDENT” table using “MIN” function.

Question

Change the following code so that there is always at least one way to get from the left corner to the top right, but the labyrinth is still randomized. The player starts at the bottom left corner of the labyrinth. He has to get to the top right corner of the labyrinth as fast he can, avoiding a meeting with the evil dragon. Take care that the player and the dragon cannot start off on walls. Also the dragon starts off from a randomly chosen position public class Labyrinth { private final int size; private final Cell[][] grid; public Labyrinth(int size) { this.size = size; this.grid = new Cell[size][size]; generateLabyrinth(); } private void generateLabyrinth() { Random rand = new Random(); for (int i = 0; i < size; i++) { for (int j = 0; j < size; j++) { // Randomly create walls and paths grid[i][j] = new Cell(rand.nextBoolean()); } } // Ensure start and end are…

Answer 1

Question

Chapter 4, Problem 18TD

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.

Subquery:

Subquery means one query is placed inside with another query.

The inner query is called a subquery.

The subquery is calculated first.

After the subquery has been determined and the outer query can apply the results of the subquery.

Example:

The example for subquery is given below:

SELECT ORDER_NUMBER FROM ORDER_LINE WHERE BOOK_NUMBER IN(SELECT BOOK_NUMBER FROM BOOKS WHERE CATEGORY = 'CE');

The above query is used to list the order number using subquery.

From the given query, the subquery is “(SELECT BOOK_NUMBER FROM BOOKS WHERE CATEGORY = 'CE')”.

The subquery is computed first and then outer query is computed.

The outer query retrieves the order number on every row in the “ORDER_LINE” table for which the book number is in the results of the subquery.

Because that table contains only the book numbers in category “CE”, the results display the preferred list of order numbers.

“MIN” function:

It is the one function of aggregate function.

The “MIN” function is used to compute the minimum value in a column.

Example:

The example for “MIN” function is given below:

SELECT MIN(MARK_CREDIT) FROM STUDENT;

The above query is used to display the minimum mark credit from “STUDENT” table using “MIN” function.

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