Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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- Third 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.arrow_forwardSQL A table Products have: a name (TEXT) a description (TEXT) a unit cost stored in cents (INTEGER) and of course we also add an id column to identify them. Separately, we'd like to track the number of items in stock for each product. To do so we'll have a store and an inventory table. Stores have just an id and a name. Then, our inventory table should combine stores and products, listing how much of each product each store has in stock. a product_id (INTEGER) a store_id (INTEGER) a quantity (INTEGER) in stock Now we can insert some stores, products and inventory into our database. There are 2 stores -- one called NY and one called NJ. There are 2 products we are concerned with. Their names are sneakers, costing $220 (remember this is dollars!) and boots costing $350. Use any description for each that you'd like. NY has 4 sneakers in stock and 3 boots. NJ has 5 sneakers in stock and no boots. Insert the above data into the tables you have created.arrow_forwardGiven an existing table called Country, write a statement to delete a column called Name from the table. ALTER TABLE Country *Your code goes here */arrow_forward
- https://www.w3schools.com/sql/trysql.asp?filename=trysql_select_allarrow_forwardIf a column value is NULL, would you consider the column to be 0 or blank (" ")?arrow_forwardQuery 3: Write a parameter query to display the names of all prospects each member tried to recruit based on the member’s first name and the member’s last name you input. List the member’s First Name, member’s Last Name, prospect’s First Name, and prospect’s Last Name (in this order in the query grid). Display the member’s First Name Heading as Member First Name, member’s Last Name Heading as Member Last Name, prospect’s first name heading as Prospect First Name, and prospect’s last name heading as Prospect Last Name. Sort the list by Member Last Name, Member First Name, Prospect Last Name, and Prospect First Name, all ascending order. (WE ARE USING ACCESS SO I AM JUST TRYING TO UNDERSTAND WHAT TO PUT AND PLUG IN ETC. USE MY PICTURES AS REFERRENCE!)arrow_forward
- 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 valuesarrow_forwardIf we implement a queue using an array where we treat the array as if its two ends are "taped together", we call that a linear array. O True Falsearrow_forwardIntersection table is needed when you have a relationship 1:1 M:N M:1 1:Marrow_forward
- Minimize the following DFA: 0 1 →90 q1 90 91 qo 92 92 93 91 *q3 93 90 94 93 95 95 96 q4 96 95 96 q7 96 q3 Hint: Use the "table filling method" for minimizing your DFA (if needed).arrow_forwardWhy it's useful to have index that partially sort a query if it doesn't present all of the results already sorted?arrow_forwardcalculate_new_balance Given a starting balance (a number), and a list of transaction tuples, calculate the final balance for an account. Transaction tuples are of the shape ("description", amount, "withdrawal") , or ("description", amount, "deposit"). The last entry in the tuple will be either "withdrawal" or "deposit". Every withdrawal decreases the balance of the account by the specified amount, and every deposit increases the balance. The return value is the new account balance, as a number. (which could be negative) Sample calls should look like: >>> calculate_new_balance(100, [("payday", 20, "deposit"), ("new shoes", 50, "withdrawal"), ("illicit winnings", 200, "deposit")])270>>> calculate_new_balance(100, [])100arrow_forward
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