A Guide to SQL
9th Edition
ISBN: 9781337668880
Author: Pratt
Publisher: Cengage
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Chapter 6, Problem 8CAT
Program Plan Intro
UPDATE command:
- The UPDATE command is employed to update information present in a table.
- It is always used with SET keyword either in bulk or individually.
Syntax for update the value in the table is given as follows:
The Syntax for update the value in the table is given below:
UPDATE table_name
SET column1 = data1, column2 = data2, ...
WHERE condition;
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Consider the following database for some store:
Customers (cid, cname, city, discount)Agents (aid, aname, city, percent)Products (pid, pname, city, quantity, price)Orders (ordno, mon, cid, aid, pid, qty, dollars)
The relation Customers records the ID (cid), name (cname), location (city) of each customer and a discount percentage (discount) for this customer.
The relation Agents records the ID (aid), name (aname), location (city) of each agent and a transaction fee (percent) charged by this agent.
The relation Products lists the ID (pid), name (pname), location (city), quantity and price of available products.
And finally, the relation Orders contains a unique order number (ordno), the month (mon), customer (cid), agent (aid), product (pid), quantity (qty) of each order as well as the total value (dollars) of the transaction.
1. Express the following query in SQL
(a) List customers (names) who do not have discounts but purchased at least one product of price greater than $50.
(b) Find…
Consider the following relational schema and briefly answer the questions that follow:
Emp(eid: integer, ename: string, age: integer, salary: real)
Works(eid: integer, did: integer, pct_time: integer)
Dept(did: integer, budget: real, managerid: integer)
a. Define a table constraint on Dept that will ensure that all managers have age > 30.
b. Write SQL statements to delete all information about employees whose salaries exceed that of the manager of one or more departments that they work in. Be sure to ensure that all the relevant integrity constraints are satisfied after your updates.
Chapter 6 Solutions
A Guide to SQL
Ch. 6 - Prob. 1RQCh. 6 - Which command and clause adds an individual row to...Ch. 6 - How do you add data from an existing table to...Ch. 6 - Prob. 4RQCh. 6 - Which command removes rows from a table?Ch. 6 - Which command makes updates permanent?Ch. 6 - Which command reverses updates? Which updates are...Ch. 6 - Prob. 8RQCh. 6 - What is the format of the SET clause that changes...Ch. 6 - Which command and clause adds a column to an...
Ch. 6 - Prob. 11RQCh. 6 - Which command deletes a table and all its data?Ch. 6 - Prob. 13RQCh. 6 - Prob. 1TDCh. 6 - Prob. 2TDCh. 6 - Prob. 3TDCh. 6 - Prob. 4TDCh. 6 - Prob. 5TDCh. 6 - Prob. 6TDCh. 6 - In the NONGAME table, change the category for item...Ch. 6 - Prob. 8TDCh. 6 - Prob. 9TDCh. 6 - Prob. 10TDCh. 6 - Prob. 11TDCh. 6 - Use SQL to make the following changes to the...Ch. 6 - Prob. 2CATCh. 6 - Prob. 3CATCh. 6 - Prob. 4CATCh. 6 - Prob. 5CATCh. 6 - Prob. 6CATCh. 6 - Add to the PADDLING table a new character column...Ch. 6 - Prob. 8CATCh. 6 - Prob. 9CATCh. 6 - Prob. 10CATCh. 6 - Prob. 11CATCh. 6 - Prob. 12CATCh. 6 - Use SQL to make the following changes to the...Ch. 6 - Prob. 2SCGCh. 6 - Prob. 3SCGCh. 6 - Prob. 4SCGCh. 6 - Prob. 5SCGCh. 6 - Prob. 6SCGCh. 6 - Prob. 7SCGCh. 6 - Prob. 8SCGCh. 6 - Prob. 9SCGCh. 6 - Prob. 10SCGCh. 6 - Prob. 11SCGCh. 6 - Prob. 12SCG
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