What is the maximum number of columns you can define as a primary key when using the column-level approach to creating a table? ( refer to the tables in the JustLee Books database). a. 0 b. 1 c. 30 d. 255

What is the maximum number of select statements that may be combined from a single table?

Assume that a database has a table named Stock, with the following columns:Column Name TypeTrading_Symbol nchar(10)Company_Name nchar(25)Num_Shares intPurchase_Price moneySelling_Price moneyWrite a Select statement that returns the Trading_Symbol column only from the rows where Purchase_Price is greater than 25ドル.00.

Refer to the film and inventory tables of the Sakila database. The tables in this lab have the same columns and data types but fewer rows. Write a query that lists the titles of films with the fewest rows in the inventory table. This query requires a subquery that computes the minimum of counts by film_id: SELECT MIN(count_film_id) FROM ( SELECT COUNT(film_id) AS count_film_id FROM inventory GROUP BY film_id ) AS temp_table; This subquery is provided in the template.

Which of these is more important, Primary Key or Unique? In the JustLee Books database, you may look up the tables

First normal form says: a. No nonkey columns depend on another nonkey column b. Every column that's not part of the primary key is fully dependent on the primary key. c. Eliminate repeated fields. d. None of the above

How can we check if a table has minimum redundency?A) There is no way to checkB) See if a table has any primary values duplicated somewhere elseC) Use a normal form to checkD) See if a table has a lot of null values

A Pivot Table is the column name with its table name. O True O False

Inconsistencies:Although update queries can help, you still need human intervention to remove inconsistent values. T to F?

Create table statements (file name must be: 1_create_table.txt). Make sure you specify primary keys and foreign keys. Specifying "not null" constraint is optional. Specifying "on delete action" and "on update action" are optional.

Instructorld 1 • Courseld CourseCode 9630 MATH109 Course CourseName Linear Algebra Capacity 175 4964 PHILAT Intro to Philosophy 50 4253 MATH19 Number Theory 150 1896 HIST66 American History 25 8048 HIST58 World History 125 2133 Instructor Instructorld InstructorName Rank Department Del Day Associate Professor Math Rob Ruiz Associate Professor Philosophy Aya Diaz Associate Professor History Note: Both tables may not be necessary to complete this level. Select the rows returned by the query below. SELECT CourseName, Capacity, InstructorId FROM Course C WHERE Capacity> (SELECT AVG (Capacity) FROM Course WHERE InstructorId = c.InstructorId); CourseName Linear Algebra Capacity Instructorld 175 1 Intro to Philosophy 50 2 150 Number Theory American History 25 World History 125 2133

Alternate keys: Identify at least five keys (not already listed as PK or FK) needed by end users. These indexes would be considered Alternate or Secondary keys and are mostly used for queries and quick reporting. They may contain multiple columns. Books Authors Bookstore Members Sales transaction table Inventory table

Assistance with SQL statements Previous code; CREATE TABLE Lab4program_piershed ( code VARCHAR(5) PRIMARY KEY, name VARCHAR(20), tel VARCHAR(20));CREATE TABLE Lab4course_xxxx ( cid INT PRIMARY KEY, name VARCHAR(20), credits INT, mycode VARCHAR(5), FOREIGN KEY (mycode) REFERENCES Lab4program_xxxx(code)); 1. Insert 3 records into your Lab4program_xxxx table. The code should be "CPS", "TECH", "MATH", or "BIO". Please copy/paste your SQL statements with the output message in the text that shows you successfully insert 3 records to your table. 2. Insert 4 records into your Lab4course_xxxx table with at least 2 different mycode. Please copy/paste your SQL statements with the output message in the text that shows you successfully insert 4 records to your table.