“GROUP BY” Clause: The GROUP BY 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) FROM table_name WHERE conditions GROUP BY expression1, expression2, expression_n; DISTINCT Keyword: “DISTINCT” keyword is used to avoid redundant data (removing duplicate values) from a column. The syntax for “DISTINCT” keyword is as follows: Syntax: SELECT DISTINCT column_Name FROM table_Name; Join: Join is a relational operation, which combines the data from two or more tables into single table or view, then that is called as Join. Inner join: The “inner join” keyword is to select the matching records from two tables. The syntax of “inner join” is as follows: Syntax: SELECT column_name FROM table1 INNER JOIN table2 ON table1.column_name=table2.column_name;

Question

2. Consider the following pseudocode for partition: function partition (A,L,R) pivotkey = A [R] t = L for i L to R-1 inclusive: if A[i] A[i] t = t + 1 end if end for A [t] A[R] return t end function Suppose we call partition (A,0,5) on A=[10,1,9,2,8,5]. Show the state of the list at the indicated instances. Initial A After i=0 ends After 1 ends After i 2 ends After i = 3 ends After i = 4 ends After final swap 10 19 285 [12 pts]

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Chapter 7, Problem 20P

Program Plan Intro

“GROUP BY” Clause:

The GROUP BY 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) FROM table_name WHERE conditions GROUP BY expression1, expression2, expression_n;

DISTINCT Keyword: “DISTINCT” keyword is used to avoid redundant data (removing duplicate values) from a column. The syntax for “DISTINCT” keyword is as follows:

Syntax:

SELECT DISTINCT column_Name FROM table_Name;

Join:

Join is a relational operation, which combines the data from two or more tables into single table or view, then that is called as Join.

Inner join:

The “inner join” keyword is to select the matching records from two tables. The syntax of “inner join” is as follows:

Syntax:

SELECT column_name FROM table1 INNER JOIN table2 ON table1.column_name=table2.column_name;

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2. Consider the following pseudocode for partition: function partition (A,L,R) pivotkey = A [R] t = L for i L to R-1 inclusive: if A[i] A[i] t = t + 1 end if end for A [t] A[R] return t end function Suppose we call partition (A,0,5) on A=[10,1,9,2,8,5]. Show the state of the list at the indicated instances. Initial A After i=0 ends After 1 ends After i 2 ends After i = 3 ends After i = 4 ends After final swap 10 19 285 [12 pts]

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