Please explain: Give an example of a table definition (CREATE TABLE statement) that includes a user level constraint. Are they supported by all databases?

A concise explanation of the many reasons why the use of tables in database design is a good idea could be of some use. Would you mind providing a brief remark on the subject of NULL?

The FOREIGN KEY constraint should be added to which table? ( refer to the tables in the JustLee Books database).                                                              a. the table representing the "one" side of a one-to-many relationship            b. the parent table in a parent-child relationship                                              c. the child table in a parent-child relationship                                                    d. the table that doesn’t have a primary key

Explain what the <tbody>, <thead>, and <tfoot> tags are and how they are used. What kinds of tables use them most often?

What are the differences between the JOIN … USING and JOIN … ON approaches for joining tables?

Define fourth normal form. What types of problems would you find in tables that are not in fourth normal form?

For this problem create a (temporary) table called instructor_course_nums. Write a procedure that accepts an instructor ID as input. The procedure calculates the total number of course sections taught by that instructor, and adds a tuple to the temporary table consisting of the instructors ID number, name, and total courses taught - call these attributes: ID, name, and tot_courses. If the instructor already has an entry in the table,then the procedure makes sure the total number of courses taught in the temporary table is up-to-date. You must name your procedure: Written in PostgreSQL

How do we decide which model to generate when creating tables in Microsoft Access?

Define the term referential integrity constraint. Give an example of a referential integrity constraint for the tables you created for question 1.8.

You are working with a database table that contains invoice data. The table includes columns for invoice_id and billing_state. You want to remove duplicate entries for billing state and sort the results by invoice ID. You write the SQL query below. Add a DISTINCT clause that will remove duplicate entries from the billing_state column. NOTE: The three dots (...) indicate where to add the clause. SELECT ... FROM invoice ORDER BY invoice_id What billing state appears in row 17 of your query result? 1 point 1-CA 2-NV 3-WI 4-AZ