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Database - Database Redesign

Exercise : Database Redesign - General Questions
6.
Before any changes to database structure are attempted one should first:
clearly understand the current structure and contents of the database only.
test any changes on a test database only.
create a complete backup of the operational database only.
All of the above should be done.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
Which of the following modifications may not succeed?
Changing a column data type from char to date
Changing a column data type from numeric to char
Both of the above actions should succeed.
Neither of the above actions will succeed.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
How can you find rows that do not match some specified condition?
EXISTS
Double use of NOT EXISTS
NOT EXISTS
None of the above is correct.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
A regular subquery can be processed:
from the top down.
from the bottom up.
by nesting.
None of the above is correct.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
What SQL command can be used to add columns to a table?
MODIFY TABLE TableName ADD COLUMN ColumnName
MODIFY TABLE TableName ADD ColumnName
ALTER TABLE TableName ADD COLUMN ColumnName
ALTER TABLE TableName ADD ColumnName
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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