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 keyword: This keyword is used to round off the integer value. The syntax is given as follows: ROUND(value,decimal_value) Here, the “value” represents the round off value and “decimal_value” represents the number of digits that should appear after the decimal point. “decimal_value” is optional.

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A Dia file has been created for you to extend and can be found on Company.dia represents a completed ER schema which, models some of the information implemented in the system, as a starting point for this exercise. Understanding the ER schema for the Company database. To demonstrate that you understand the information represented by the schema, explain using EMPLOYEE, DEPARTMENT, PROJECT and DEPENDENT as examples: attributes, entities and relationships cardinality & participation constraints on relationships You should explain questions a and b using the schema you have been given to more easily explain your answers. Creating and Extending Entity Relationship (EER) Diagrams. To demonstrate you can create entity relationship diagrams extend the ER as described in Company.dia by modelling new requirements as follows: Create subclasses to extend Employee. The employee type may be distinguished further based on the job type (SECRETARY, ENGINEER, MANAGER, and TECHNICIAN) and based…

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Chapter 7, Problem 103P

Program Plan Intro

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 keyword: This keyword is used to round off the integer value. The syntax is given as follows:

ROUND(value,decimal_value)

Here, the “value” represents the round off value and “decimal_value” represents the number of digits that should appear after the decimal point. “decimal_value” is optional.

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