“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; Aggregate Functions: SQL has some built-in functions and they are called as aggregate functions. SQL contains five built-in functions. They are: SUM – This function is used to add values from the particular column. Syntax: SELECT SUM(column_Name) FROM table_Name; COUNT – This is used to count the number of rows for the particular column. Syntax: SELECT COUNT(column_Name) FROM table_Name; MAX – This function is used to get the maximum value from the column. Syntax: SELECT MAX(column_Name) FROM table_Name; MIN – This function is used to get the minimum value from the column. Syntax: SELECT MIN(column_Name) FROM table_Name; AVG – This function is used to get the average of all the values from the column. Syntax: SELECT AVG(column_Name) FROM table_Name; “Round()” function: The function used to round a number that specified in decimal places. The format of the “Round()” function is as follows: Syntax: ROUND(number, decimal_places)

Question

Question D.4: FIFO Page Replacement Consider the following page reference string: e, c, b, e, a, g, d, c, e, g, d, a Considering 4 frames, fill in the following table and then answer how many page faults would occur with the FIFO page replacement algorithm. RS: reference string; FO: frame 0, F1: frame 1, etc. Hint: all frames are initially empty, so your first unique pages will all cost one fault each. Time 1234567891011 12 RS e cb e agd ce g d a FO F1 F2 F3 Page fault? b) Total # page faults: c) Briefly (1-2 sentences) explain Belady's Anomaly that can occur in FIFO Page Replacement.

Answer 1

Question

Chapter 7, Problem 45P

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;

Aggregate Functions:

SQL has some built-in functions and they are called as aggregate functions. SQL contains five built-in functions. They are:

SUM – This function is used to add values from the particular column.

Syntax: SELECT SUM(column_Name) FROM table_Name;

COUNT – This is used to count the number of rows for the particular column.

Syntax: SELECT COUNT(column_Name) FROM table_Name;

MAX – This function is used to get the maximum value from the column.

Syntax: SELECT MAX(column_Name) FROM table_Name;

MIN – This function is used to get the minimum value from the column.

Syntax: SELECT MIN(column_Name) FROM table_Name;

AVG – This function is used to get the average of all the values from the column.

Syntax: SELECT AVG(column_Name) FROM table_Name;

“Round()” function:

The function used to round a number that specified in decimal places. The format of the “Round()” function is as follows:

Syntax:

ROUND(number, decimal_places)

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