Primary Key: A primary key in a database table is a field in the table that uniquely identifies every row or record present in the database table. Example: Students in Universities are assigned a unique registration number. Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key. Foreign Key: Foreign key is a column in a relational database table which provides a relation between two tables. It provides a cross reference between tables by pointing to primary key of another table. Example: In STUDENT database table, the attribute “reg_no” acts as primary key and in COURSE database table in which the student selects his or her course, the same “reg_no” acts as foreign key for the STUDENT table. Many to One relationship: When more than one record in a database table is associated with only one record in another table, the relationship between the two tables is referred as many to one relationship. It is also represented as M: 1 relationship. One to Many relationships: When one record in a database table is associated with more than one record in another table, the relationship between the two tables is referred as one to many relationships. It is also represented as1: M relationship. This is the opposite of many to one relationship. CROW FOOT ERD: The Crow Foot ERD is an Entity Relationship Diagram which is used to represent the cardinalities present in the basic ER diagram. It is used to represent the relationships present between two tuples or tables present in the database.

Question

Create a relationship between the common field (Technician Number) of the two tables. Make sure that each client must have 1 and only 1 technician assigned, and each technician can have multiple clients. 2. Create a query to show the Client Number, Client Name, Billed, Paid for clients in Anderson city. Save the query. 3. Create a query to show the Technician Number, Last Name, First Name, YTD Earnings for technicians whose Hourly Rate is greater than or equal to 30. Save the query. 4. Create a query to show Client Number, Client Name, Billed, Paid for clients whose technician number is 22 and whose Billed is over 300. Save the query. 5. Create a query to show the Technician Number, Last Name, First Name, Client Number, Client Name for clients whose technician number 23. Save the query. 6. Create a query to show the Technician Number, Last Name, First Name, Client Number, Client Name for clients whose technician number 23 or 29. Save the query Help please Microsoft office access

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Chapter 3, Problem 15P

Program Plan Intro

Primary Key:

A primary key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Foreign Key:

Foreign key is a column in a relational database table which provides a relation between two tables. It provides a cross reference between tables by pointing to primary key of another table.

Example:

In STUDENT database table, the attribute “reg_no” acts as primary key and in COURSE database table in which the student selects his or her course, the same “reg_no” acts as foreign key for the STUDENT table.

Many to One relationship:

When more than one record in a database table is associated with only one record in another table, the relationship between the two tables is referred as many to one relationship. It is also represented as M: 1 relationship.

One to Many relationships:

When one record in a database table is associated with more than one record in another table, the relationship between the two tables is referred as one to many relationships. It is also represented as1: M relationship. This is the opposite of many to one relationship.

CROW FOOT ERD:

The Crow Foot ERD is an Entity Relationship Diagram which is used to represent the cardinalities present in the basic ER diagram. It is used to represent the relationships present between two tuples or tables present in the database.

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Create a relationship between the common field (Technician Number) of the two tables. Make sure that each client must have 1 and only 1 technician assigned, and each technician can have multiple clients. 2. Create a query to show the Client Number, Client Name, Billed, Paid for clients in Anderson city. Save the query. 3. Create a query to show the Technician Number, Last Name, First Name, YTD Earnings for technicians whose Hourly Rate is greater than or equal to 30. Save the query. 4. Create a query to show Client Number, Client Name, Billed, Paid for clients whose technician number is 22 and whose Billed is over 300. Save the query. 5. Create a query to show the Technician Number, Last Name, First Name, Client Number, Client Name for clients whose technician number 23. Save the query. 6. Create a query to show the Technician Number, Last Name, First Name, Client Number, Client Name for clients whose technician number 23 or 29. Save the query Help please Microsoft office access

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