Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Chapter 8, Problem 1HOA
Program Plan Intro
Basic form of the SQL SELECT command:
The basic form of the SQL SELECT command is given below:
Basic form: SELECT-FROM-WHERE
Explanation:
- The SQL SELECT command is used to retrieve given values in a
database . - From the given basic form, a After user type the word "SELECT", user list the columns that they want to include in the query results.
- Next, user type the word "FROM" followed by table name that have the data user need to query.
- Finally, user can list conditions that apply to the data they want to retrieve after the word "WHERE".
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Can you check if my explation is correct:
Challenge: Assume that the assigned network addresses are correct. Can you deduce (guess) what the network subnet masks are? Explain while providing subnet mask bits for each subnet mask.
[Hint: Look at the addresses in binary and consider the host ids]
To assume that the network addresses are correct, we take a look at the network ID and IP addresses. Take 20.0.0.0/8, we have an /8 prefix which is Class A, that provide us with 255.0.0.0. This means that there are 24 host bits while the network bits are 8. When compared to the IP address 20.255.0.7, we can perform an additional operation with the subnet mask giving us 20.0.0.0. The same happened with 20.0.0.89, which we also got 20.0.0.0. Therefore, these two IP addresses fall within the respective /8 subnet. For 200.100.10.0/30, the /30 is Class C with a subnet mask of 255.255.255.252, meaning 30 network bits and only two host bits. When applying the subnet mask and the IP addresses…
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