“COUNT()” function: In SQL, the “COUNT ()” function will return the total number of rows in the table with satisfying the criteria mentioned in the “WHERE” clause. DISTINCTROW Keyword: The “DISTINCTROW” keyword omits data based entire duplicate records, not like just duplicate fields. The syntax for “DISTINCT” keyword is as follows: Syntax: SELECT DISTINCTROWcol_Name FROM table_Name1 INNER JOIN table_Name2 ON table_Name1.col_Name = table_Name2.col_Name ORDER BY table_Name1; SUM function: The “SUM” function is used to add the value and then return the sum of the expression in a “SELECT” statement. Syntax: SELECT SUM (exp) FROM table_Name [WHERE condition]; GROUP BY Clause: The GROUPBY clause is used to group the result of a SELECT statement done on a table where the tuple values are similar for more than one column Syntax: SELECT expression1, expression2, expression_n, aggregate_function(expression)FROMtable_name WHERE conditions GROUP BY expression1, expression2, expression_n; INNER JOIN keyword: “INNER JOIN” keyword is used to select all the matching records of both the table. Syntax: SELECT col_Name FROM table_Name1 INNER JOIN table_Name2 ON table_Name1.col_Name = table_Name2.col_Name;

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7. See the code below and solve the following. public class Test { public static void main(String[] args) { int result = 0; } result = fn(2,3); System.out.println("The result is: + result); // fn(x, 1) = x // fn(x, y) = fn(x, y-1) + 2, when y>1 public static int fn(int x, int y) { if (x <= 1) return x; else return fn(x, y-1) + 2; } } 7-1. This program has a bug that leads to infinite recursion. Modify fn(int x, int y) method to fix the problem. (2 point) 7-2. Manually trace the recursive call, fn(2,3) and show the output (step by step). (2 point) 7-3. Can you identify the Base Case in recursive method fn(int x, int y)? (1 point)

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Chapter 7, Problem 31P

Program Plan Intro

“COUNT()” function:

In SQL, the “COUNT ()” function will return the total number of rows in the table with satisfying the criteria mentioned in the “WHERE” clause.

DISTINCTROW Keyword:

The “DISTINCTROW” keyword omits data based entire duplicate records, not like just duplicate fields. The syntax for “DISTINCT” keyword is as follows:

Syntax:

SELECT DISTINCTROWcol_Name FROM table_Name1 INNER JOIN table_Name2 ON table_Name1.col_Name = table_Name2.col_Name ORDER BY table_Name1;

SUM function:

The “SUM” function is used to add the value and then return the sum of the expression in a “SELECT” statement.

Syntax:

SELECT SUM (exp) FROM table_Name [WHERE condition];

GROUP BY Clause:

The GROUPBY clause is used to group the result of a SELECT statement done on a table where the tuple values are similar for more than one column

Syntax:

SELECT expression1, expression2, expression_n, aggregate_function(expression)FROMtable_name WHERE conditions GROUP BY expression1, expression2, expression_n;

INNER JOIN keyword:

“INNER JOIN” keyword is used to select all the matching records of both the table.

Syntax:

SELECT col_Name FROM table_Name1 INNER JOIN table_Name2 ON table_Name1.col_Name = table_Name2.col_Name;

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