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NEW QUESTION: 1

A. Option B
B. Option A
C. Option C
D. Option D
Answer: A,B

NEW QUESTION: 2
What is a common use case for the IBM Watson Natural Language Classifier service?
A. Design marketing material and provide product recommendations that is more personal and relevant
B. Organize tweets into a set of categories, such as events, news, or opinions
C. Enable back and forth natural language conversations with a user for clarifying questions or helping a user take an action
D. Find the right person for a specific job or project based on classifications found in a person's resume
Answer: B

NEW QUESTION: 3
Hinweis: Diese Frage ist Teil einer Reihe von Fragen, die dasselbe Szenario verwenden. Zur Vereinfachung wird das Szenario in jeder Frage wiederholt. Jede Frage stellt ein anderes Ziel und eine andere Antwortauswahl dar, aber der Text des Szenarios ist in jeder Frage dieser Reihe genau gleich.
Sie haben eine Datenbank mit dem Namen Sales, die die folgenden Datenbanktabellen enthält: Customer, Order und Products.
Die Tabelle "Produkte" und die Tabelle "Bestellung" sind in der folgenden Abbildung dargestellt.

Die Kundentabelle enthält eine Spalte, in der die Daten für die letzte Bestellung des Kunden gespeichert sind.
Sie planen, eine Tabelle mit dem Namen Leads zu erstellen. Es wird erwartet, dass die Tabelle Leads ungefähr 20.000 Datensätze enthält.
Der Speicherbedarf für die Leads-Tabelle muss minimiert werden.
Sie müssen das Datenbankdesign ändern, um die folgenden Anforderungen zu erfüllen:
* Zeilen in der Orders-Tabelle müssen immer einen gültigen Wert für die ProductID-Spalte haben.
* Zeilen in der Tabelle "Produkte" dürfen nicht gelöscht werden, wenn sie Teil von Zeilen in der Tabelle "Bestellungen" sind.
* Alle Zeilen in beiden Tabellen müssen eindeutig sein.
Identifizieren Sie in der folgenden Tabelle die Einschränkung, die für jede Tabelle konfiguriert werden muss.
HINWEIS: Nehmen Sie in jeder Spalte nur eine Auswahl vor.

Answer:
Explanation:

Explanation

A FOREIGN KEY in one table points to a PRIMARY KEY in another table. Here the foreign key constraint is put on the ProductID in the Orders, and points to the ProductID of the Products table.
With a check constraint on the ProductID we can ensure that the Products table contains only unique rows.
References:
http://www.w3schools.com/sql/sql_foreignkey.asp