What is the purpose of the substring() method and how do you use it?
What will be an ideal response?
You can extract part of a String with the substring() method, and use it alone or concatenate it with another String. The substring() method takes two integer arguments-a start position and an end position-that are both based on the fact that a String's first position is position zero. The length of the extracted substring is the difference between the second integer and the first integer; if you write the method without a second integer, the substring extends to the end of the original string.
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What are the Amazon EC2 API tools?
A. They don't exist. The Amazon EC2 AMI tools, instead, are used to manage permissions. B. Command-line tools to the Amazon EC2 web service. C. They are a set of graphical tools to manage EC2 instances. D. They don't exist. The Amazon API tools are a client interface to Amazon Web Services.
Create a sequence to add room IDs and then insert a new room into LOCATION table using the newly created sequence. What is the CURRVAL after the new row is inserted?
Use case study databases for the following queries.