[Free] 2018(Jan) EnsurePass Testking Oracle 1z0-061 Dumps with VCE and PDF 31-40

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Oracle Database 12c: SQL Fundamentals

Question No: 31

Examine the structure of the customers table:

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CUSTNO is the primary key in the table. You want to find out if any customers#39; details have been entered more than once using different CUSTNO, by listing all the duplicate names.

Which two methods can you use to get the required result?

  1. Self-join

  2. Subquery

  3. Full outer-join with self-join

  4. Left outer-join with self-join

  5. Right outer-join with self-join

Answer: A,B

Question No: 32

View the Exhibit and examine the data in the PROMO_NAME and PROMO_END_DATE columns of the promotions table, and the required output format.

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Which two queries give the correct result?

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

Answer: C,D

Question No: 33

View the Exhibit and examine the structure of the SALES table.

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The following query is written to retrieve all those product IDs from the SALES table that have more than 55000 sold and have been ordered more than 10 times.

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Which statement is true regarding this SQL statement?

  1. It executes successfully and generates the required result.

  2. It produces an error because count(*) should be specified in the SELECT clause also.

  3. It produces an error because count{*) should be only in the HAVING clause and not in the WHERE clause.

  4. It executes successfully but produces no result because COUNT (prod_id) should be used instead of COUNT (*).

    Answer: C Explanation:

    Restricting Group Results with the HAVING Clause

    You use the HAVING clause to specify the groups that are to be displayed, thus further restricting the groups on the basis of aggregate information.

    In the syntax, group_condition restricts the groups of rows returned to those groups for which the specified condition is true.

    The Oracle server performs the following steps when you use the HAVING clause:

    1. Rows are grouped.

    2. The group function is applied to the group.

    3. The groups that match the criteria in the HAVING clause are displayed.

      The HAVING clause can precede the GROUP BY clause, but it is recommended that you place the GROUP BY clause first because it is more logical. Groups are formed and group functions are calculated before the HAVING clause is applied to the groups in the SELECT list.

      Note: The WHERE clause restricts rows, whereas the HAVING clause restricts groups.

      Question No: 34

      Which statement is true regarding the UNION operator?

      1. By default, the output is not sorted.

      2. Null values are not ignored during duplicate checking.

      3. Names of all columns must be identical across all select statements.

      4. The number of columns selected in all select statements need not be the same.

Answer: D Explanation:

The SQL UNION query allows you to combine the result sets of two or more SQL SELECT

statements. It removes duplicate rows between the various SELECT statements.

Each SQL SELECT statement within the UNION query must have the same number of fields in the result sets with similar data types.

Question No: 35

You execute the following commands:

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For which substitution variables are you prompted for the input?

  1. None, because no input required

  2. Both the substitution variables #39;hiredate#39; and #39;mgr_id\

  3. Only #39;hiredate#39;

  4. Only #39;mgr_id#39;

Answer: B

Question No: 36

Evaluate the following query:

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What would be the outcome of the above query?

  1. It produces an error because flower braces have been used.

  2. It produces an error because the data types are not matching.

  3. It executes successfully and introduces an #39;s at the end of each PROMO_NAME in the output.

  4. It executes successfully and displays the literal quot;{#39;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 lt;angle bracketsgt;. Using the q operator, the character delimiter can effectively be changed from a single quotation mark to any other character

The syntax of the alternative quote operator is as follows:

q#39;delimiter#39;character literal which may include the single quotes delimiter#39; where delimiter can be any character or bracket.

Alternative Quote (q) Operator

Specify your own quotation mark delimiter. Select any delimiter.

Increase readability and usability.

SELECT department_name || q#39;[ Department#39;s Manager Id: ]#39;

|| manager_id

AS quot;Department and Managerquot; FROM departments;

Alternative Quote (q) Operator

Many SQL statements use character literals in expressions or conditions. If the literal itself contains a single quotation mark, you can use the quote (q) operator and select your own quotation mark delimiter.

You can choose any convenient delimiter, single-byte or multi byte, or any of the following

character pairs: [ ], { }, ( ), or lt; gt;.

In the example shown, the string contains a single quotation mark, which is normally interpreted as a delimiter of a character string. By using the q operator, however, brackets [] are used as the quotation mark delimiters. The string between the brackets delimiters is interpreted as a literal character string.

Question No: 37

View the Exhibits and examine the structures of the products, sales, and customers tables.

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You need to generate a report that gives details of the customer#39;s last name, name of the product, and the quantity sold for a customers in #39;Tokyo#39;.

Which two queries give the required result?

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

Answer: A,C

Question No: 38

You want to display 5 percent of the rows from the sales table for products with the lowest AMOUNT_SOLD and also want to include the rows that have the same AMOUNT_SOLD even if this causes the output to exceed 5 percent of the rows.

Which query will provide the required result?

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

    Answer: D

    Question No: 39

    Examine the types and examples of relationships that follow:

    1. One-to-one a) Teacher to students

    2. One-to-many b) Employees to Manager

    3. Many-to-one c) Person to SSN

    4. Many-to-many d) Customers to products

      Which option indicates the correctly matched relationships?

      A. 1-a, 2-b, 3-c, and 4-d

      B. 1-c, 2-d, 3-a, and 4-b

      C. 1-c, 2-a, 3-b, and 4-d

      D. 1-d, 2-b, 3-a, and 4-c

      Answer: C

      Question No: 40

      View the Exhibit and examine the description of SALES and PROMOTIONS tables.

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      You want to delete rows from the sales table, where the PROMO_NAME column in the promotions table has either blowout sale of everyday low prices as values.

      Which three delete statements are valid?

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      1. Option A

      2. Option B

      3. Option C

      4. Option D

Answer: B,C,D

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