18: b format
20: b ctrl + and left mouse button
Answer:
The answer is "Referential integrity".
Explanation:
This relates to one aspect of data integrity. Data across multiple tables are linked via relationships. In view of the distinct customer & invoice tables, each invoice table should have the primary key specified throughout the Customer table, for instance. Whenever the invoice table contains a customer ID reference. This ID including its customer will be only a table of the customer.
Go to panel and select stylesheet. Hope this helped:)
Primary storage refers to the main storage of the computer or main memory which is the random access memory or RAM. Secondary storage, on the other hand, refers to the external storage devices used to store data on a long-term basis.
Answer:
The correct answer for the given question is "The program has a runtime NullPointerException because test is null while executing test.x"
Explanation:
In this code their is run time exception will occur in Main method i.e "java.lang.NullPointerException "because the object of the Test class i.e test will initialized by "null" .So on executing the statement test.x it gives an Runtime Exception.The "NullPointerException" can occur if we assign the object to the "null" value that why it produce an java.lang.NullPointerException
