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You want to display all the employee names and their corresponding manager names. Evaluate the
following query:
Which join option can be used in the blank in the above query to get the required output?
A. INNER JOIN
B. FULL OUTER JOIN
C. LEFT OUTER JOIN
D. RIGHT OUTER JOIN
Answer: C
20.Evaluate the following query:
What would be the outcome of the above query?
A. It produces an error because flower braces have been used.
B. It produces an error because the data types are not matching.
C. It executes successfully and introduces an 's at the end of each PROMO_NAME in the output.
D. It executes successfully and displays the literal "{'s start date was \} * for each row in the output.
Answer: C
Explanation:
So, how are words that contain single quotation marks dealt with? There are essentially two mechanisms
available. The most popular of these is to add an additional single quotation mark next to each naturally
occurring single quotation mark in the character string Oracle offers a neat way to deal with this type of
character literal in the form of the alternative quote (q) operator. Notice that the problem is that Oracle
chose the single quote characters as the special pair of symbols that enclose or wrap any other character
literal. These character-enclosing symbols could have been anything other than single quotation marks.
Bearing this in mind, consider the alternative quote (q) operator. The q operator enables you to choose
from a set of possible pairs of wrapping symbols for character literals as alternatives to the single quote
symbols.
The options are any single-byte or multibyte character or the four brackets:
(round brackets), {curly braces}, [squarebrackets], or <angle brackets>. Using the q operator, the
character delimiter can effectively be changed from a single quotation mark to any other character
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