What happens when a constraint is followed? Unique I Primary Key (ii), Default (iii), and Check (iv) Unique I Primary Key (ii), Default (iii), and Check (iv)

What does the NOT NULL constraint mean?

1.What is the result when the following SQL query is executed on a table named products? Choose the most correct answer. SELECT AVG(Products)FROM Products; Group of answer choices The query results in an error because the is no AVG function None of the above The query results in an error be cause a column is not specified The query returns the average of the Products table 2. If the primary key in the Employee table is located in the "ID" column what is the maximum number of results the following SQL SELECT query will return? SELECT *FROM EmployeeWHERE ID = 15; Group of answer choices 2 1 3 Do not have enough information to determine the answer 0

Which of the following can be the output of an operation in relational algebra?(a) An attribute(b) A relation(c) An expression(d) All of the above

q15- Please choose all that apply

Indicate dependences and their type.

q16

Candidate Key is a key that may have many duplicates may be absent may be a foreign key contain only unique values and fully defines all other attributes in a row

Based on the ERD below, write the SQL statement to change the job description of "Database Designer" to "Database Developer". After completing this task examine the results with a select statement. (Hint: Use an Update Statement.)