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Oracle 1Z0-061

Oracle Database 12c: SQL Fundamentals

Questions and Answers : 75
Q&A Update On : November 23, 2017
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Oracle 1Z0-061

Oracle Database 12c: SQL Fundamentals

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    Oracle 1Z0-061 (Oracle Database 12c: SQL Fundamentals)

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1Z0-061 Questions and Answers

1Z0-061


Answer: A


QUESTION: 67

View the Exhibit and examine the data in the products table.


You need to display product names from the products table that belong to the 'software/other' category with minimum prices as either S2000 or S4000 and no unit of measure. You issue the following query:


Which statement is true regarding the above query?


  1. It executes successfully but returns no result.

  2. It executes successfully and returns the required result.

  3. It generates an error because the condition specified for PROD_UNIT_OF_MEASURE is not valid.

  4. It generates an error because the condition specified for the prod category column is not valid.


Answer: A


QUESTION: 68

You need to display the first names of all customers from the customers table that contain the character 'e' and have the character 'a' in the second last position. Which query would give the required output?


  1. Option A

  2. Option B

  3. Option C

  4. Option D


Answer: A


Explanation:

The SUBSTR(string, start position, number of characters) function accepts three parameters and returns a string consisting of the number of characters extracted from the source string, beginning at the specified start position: substr(' www.domain.com', 12, 6) = domain

The position at which the first character of the returned string begins. When position is 0 (zero), then it is treated as 1.

When position is positive, then the function counts from the beginning of string to find the first character.

When position is negative, then the function counts backward from the end of string.

substring_length The length of the returned string. SUBSTR calculates lengths using characters as defined by the input character set. SUBSTRB uses bytes instead of characters. SUBSTRC uses Unicode complete characters.

SUBSTR2 uses UCS2 code points. SUBSTR4 uses UCS4 code points. When you do not specify a value for this argument, then the function

The INSTR(source string, search item, [start position], [nth occurrence of search item]) function returns a number that represents the position in the source string, beginning from the given start position, where the nth occurrence of the search item begins: instr(' www.domain.com', '.', 1, 2) = 18


QUESTION: 69

Examine the structure of the customers table:


CUSTNO is the primary key in the table. You want to find out if any customers' 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: 70

You need to generate a list of all customer last names with their credit limits from the customers table. Those customers who do not have a credit limit should appear last in the list. Which two queries would achieve the required result?


  1. Option A

  2. Option B

  3. Option C

  4. Option D


Answer: B, C


Explanation:

If the ORDER BY clause is not used, the sort order is undefined, and the Oracle server may not fetch rows in the same order for the same query twice. Use the ORDER BY clause to display the rows in a specific order.

Note: Use the keywords NULLS FIRST or NULLS LAST to specify whether returned rows containing null values should appear first or last in the ordering sequence. ANSWER C Sorting

The default sort order is ascending:

  • Numeric values are displayed with the lowest values first (for example, 1 to 999).

  • Date values are displayed with the earliest value first (for example, 01-JAN-92 before 01-JAN-95).

  • Character values are displayed in the alphabetical order (for example, “A” first and “Z” last).

  • Null values are displayed last for ascending sequences and first for descending sequences.

    - ANSWER B

  • You can also sort by a column that is not in the SELECT list.


QUESTION: 71

You issue the following command to alter the country column in the departments table:


Which statement is true?


  1. It produces an error because column definitions cannot be altered to add default values.

  2. It executes successfully and all the rows that have a null value for the country column will be updated with the value 'USA'.

  3. It executes successfully. The modification to add the default value takes effect only from subsequent insertions to the table.

  4. It produces an error because the data type for the column is not specified.


Answer: B


QUESTION: 72

Which two statements are true regarding constraints?


  1. A foreign key cannot contain null values.

  2. A column with the unique constraint can contain null values.

  3. A constraint is enforced only for the insert operation on a table.

  4. A constraint can be disabled even if the constraint column contains data.

  5. All constraints can be defined at the column level as well as the table level.


Answer: B, D


QUESTION: 73

Which statement adds a column called salary to the employees table having 100 rows, which cannot contain null?


  1. Option A

  2. Option B

  3. Option C

  4. Option D


Answer: A


Reference:

www.comp.nus.edu.sg/~ooibc/courses/sql/ddl_table.htm (see changing table structures)


QUESTION: 74

Which two statements are true regarding single row functions?


  1. MOD: returns the quotient of a division

  2. TRUNC: can be used with number and date values

  3. CONCAT: can be used to combine any number of values

  4. SYSDATE: returns the database server current date and time

  5. INSTR: can be used to find only the first occurrence of a character in a string

  6. TRIM: can be used to remove all the occurrences of a character from a string


Answer: B, D


Explanation:

ROUND: Rounds value to a specified decimal TRUNC: Truncates value to a specified decimal MOD: Returns remainder of division

SYSDATE is a date function that returns the current database server date and time. Date-Manipulation Functions

Date functions operate on Oracle dates. All date functions return a value of the DATE data type except MONTHS_BETWEEN, which returns a numeric value. MONTHS_BETWEEN(date1, date2): Finds the number of months between date1 and date2. The result can be positive or negative. If date1 is later than date2, the result is positive; if date1 is earlier than date2, the result is negative. The noninteger part of the result represents a portion of the month.

ADD_MONTHS(date, n): Adds n number of calendar months to date. The value of n must be an integer and can be negative.

NEXT_DAY(date, 'char'): Finds the date of the next specified day of the week ('char') following date. The value of char may be a number representing a day or a character string.

LAST_DAY(date): Finds the date of the last day of the month that contains date The above list is a subset of the available date functions. ROUND and TRUNC number functions can also be used to manipulate the date values as shown below: ROUND(date[, 'fmt']): Returns date rounded to the unit that is specified by the format model fmt. If the format model fmt is omitted, date is rounded to the nearest day. TRUNC(date[, 'fmt']): Returns date with the time portion of the day truncated to the unit that is specified by the format model fmt. If the format model fmt is omitted, date is truncated to the nearest day.

The CONCAT Function

The CONCAT function joins two character literals, columns, or expressions to yield one larger character expression. Numeric and date literals are implicitly cast as characters when they occur as parameters to the CONCAT function. Numeric or date expressions are evaluated before being converted to strings ready to be concatenated. The CONCAT function takes two parameters. Its syntax is CONCAT(s1, s2), where s1 and s2 represent string literals, character column values, or expressions resulting in character values.

The INSTR(source string, search item, [start position], [nth occurrence of search item]) function returns a number that represents the position in the source string, beginning from the given start position, where the nth occurrence of the search item begins: instr(' www.domain.com', '.', 1, 2) = 18

The TRIM function literally trims off leading or trailing (or both) character strings from a given source string:


QUESTION: 75

Which two statements are true regarding the count function?


  1. The count function can be used only for CHAR, VARCHAR2, and NUMBER data types.

  2. Count (*) returns the number of rows including duplicate rows and rows containing null value in any of the columns.

  3. Count (cust_id) returns the number of rows including rows with duplicate customer IDs and NULL value in the CUST_ID column.

  4. Count (distinct inv_amt) returns the number of rows excluding rows containing duplicates and NULL values in the INV_AMT column.

  5. A select statement using the COUNT function with a DISTINCT keyword cannot have a where clause.


Answer: B, D


Explanation:

Using the COUNT Function

The COUNT function has three formats: COUNT(*) COUNT(expr) COUNT(DISTINCT expr)

COUNT(*) returns the number of rows in a table that satisfy the criteria of the SELECT statement, including duplicate rows and rows containing null values in any of the columns. If a WHERE clause is included in the SELECT statement, COUNT(*) returns the number of rows that satisfy the condition in the WHERE clause.

In contrast,

COUNT(expr) returns the number of non-null values that are in the column identified by expr. COUNT(DISTINCT expr) returns the number of unique, non-null values that are in the column identified by expr.

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