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| Section | Weight | Objectives |
|---|---|---|
| Reporting Aggregated Data Using Group Functions | 15% | - Describe the use of group functions - Identify the available group functions - Include or exclude grouped rows by using the HAVING clause - Group data by using the GROUP BY clause |
| Using DDL Statements to Create and Manage Tables | 14% | - Describe the data types that are available for columns - Review the table structure - Drop, rename, and truncate tables - Create a simple table - Categorize the main database objects - Alter table definitions |
| Creating Other Schema Objects | 10% | - Create and maintain indexes - Create, maintain, and use sequences - Create synonyms for database objects - Create, modify, and retrieve data from a view |
| Using Set Operators | 5% | - Describe set operators - Describe the order of precedence when the set operators are used - Use a set operator to combine multiple queries into a single query |
| Using Conversion Functions and Conditional Expressions | 10% | - Use conditional IF THEN ELSE logic in a SELECT statement - Apply the NVL, NULLIF, and COALESCE functions to data - Describe implicit and explicit data type conversion - Use the TO_CHAR, TO_NUMBER, and TO_DATE conversion functions |
| Restricting and Sorting Data | 6% | - Use DEFINE and UNDEFINE commands - Use ampersand substitution to restrict and sort output at runtime - Limit the rows that are retrieved by a query - Sort the rows that are retrieved by a query |
| Controlling User Access | 5% | - Distinguish between granting privileges and roles - Grant privileges on tables and on a view - Differentiate system privileges from object privileges |
| Using Single-Row Functions to Customize Output | 10% | - Perform arithmetic with date data - Manipulate numbers with the ROUND, TRUNC, and MOD functions - Manipulate strings with character function in the SELECT and WHERE clauses - Manipulate dates with the date functions - Describe the differences between single-row and multiple-row functions |
| Displaying Data from Multiple Tables Using Joins | 15% | - Cross join tables - Join a table to itself by using a self-join - Write SELECT statements to access data from more than one table using equijoins and non-equijoins - View data that does not meet a join condition by using outer joins |
| Using Subqueries to Solve Queries | 15% | - Write single-row and multi-row subqueries - Define subqueries - Describe the types of problems that subqueries can solve - List the types of subqueries |
| Manipulating Data | 14% | - Insert rows into a table - Control transactions - Delete rows from a table - Describe each data manipulation language (DML) statement - Update rows in a table |
| Working with Oracle Database SQL | 8% | - Create a container database - Describe the Oracle Database architecture - Start up and shut down a database - Explain the installation of Oracle Database software |
| Retrieving Data Using the SQL SELECT Statement | 5% | - Differentiate between SQL statements and SQL*Plus commands - List the capabilities of SQL SELECT statements - Execute a basic SELECT statement |
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NEW QUESTION # 114
Refer to the exhibit.
Which three statements are true?
Answer: A,D,G
NEW QUESTION # 115
Evaluate the following two queries:
SQL> SELECT cust_last_name, cust_city
FROM customers
WHERE cust_credit_limit IN (1000, 2000, 3000);
SQL> SELECT cust_last_name, cust_city
FROM customers
WHERE cust_credit_limit = 1000 or cust_credit_limit = 2000 or
cust_credit_limit = 3000
Which statement is true regarding the above two queries?
Answer: D
Explanation:
Explanation/Reference:
References:
http://oraclexpert.com/restricting-and-sorting-data/
NEW QUESTION # 116
Examine the description of the employees table:
Examine these requirements:
1- Display the last name, date of hire and the number of years of service for each employee.
2. If the employee has been employed 5 or more years but less than 10, display -5+ years of service".
3. If the employee has been employed 10 or more years but less than 15, display "10+ years of service".
4. If the employee has been employed 15 or more years, display "15-*- years of service".
5. If none of these conditions matches, display "<5 years of service".
6. Sort the results by the hire_date column.
Which statement satisfies all the requirements?
Answer: A
Explanation:
Option D is the correct SQL statement that satisfies all the requirements mentioned. The CASE statement correctly compares the hire_date to date intervals subtracted from the current date (SYSDATE) to determine the number of years of service. This CASE statement is also appropriately ordered to ensure that the first condition matched is the one returned, preventing overlapping of the conditions.
Here is how Option D works according to the requirements:
It selects the last_name and hire_date from the employees table.
The CASE statement is used to calculate the number of years of service and to display the appropriate message according to the intervals defined.
The ORDER BY hire_date clause ensures the results are sorted by the date of hire.
In Option D, the intervals are defined in the correct order, ensuring that the first true condition is the one that is used:
The first WHEN checks if the hire date is 15 or more years ago.
The second WHEN checks if it is 10 or more years ago.
The third WHEN checks if it is 5 or more years ago.
The ELSE clause covers any hire dates less than 5 years ago.
The correct syntax for the intervals is SYSDATE - hire_date >= TO_YMINTERVAL('15-0') and similarly for the 10 and 5 years intervals.
Options A, B, and C are incorrect because they have various issues, such as incorrect ordering of the CASE statement's conditions, which could lead to incorrect results due to overlapping intervals, or the use of the TO_YMINTERVAL function that may not properly cover the intended date ranges.
Reference:
Oracle Documentation on CASE Expressions: SQL Language Reference - CASE Expression Oracle Documentation on TO_YMINTERVAL Function: SQL Language Reference - TO_YMINTERVAL Oracle Documentation on ORDER BY Clause: SQL Language Reference - ORDER BY Clause Therefore, Option D is the statement that fulfills all the requirements for displaying the number of years of service based on the employee's hire date and ordered by the hire date.
NEW QUESTION # 117
Evaluate the following statement.
Which statement is true regarding the evaluation of rows returned by the subquery in the INSERT statement?
Answer: C
Explanation:
Explanation
http://psoug.org/definition/WHEN.htm
NEW QUESTION # 118
Which three queries use valid expressions?
Answer: A,C,F
Explanation:
When evaluating whether expressions in SQL queries are valid, consider data type compatibility and the operations performed:
* Option A: Valid. The expression performs arithmetic operations (multiplication and division) on numeric data types (unit_price, constants). These operations are allowed and make sense in a mathematical context.
* Option B: Valid. This query calculates the difference between two dates (expiry_date and delivery_date), which results in a numeric value representing the number of days between the dates. The result is then multiplied by 2, which is a valid operation on a numeric result.
* Option C: Invalid. The expression unit_price || 5 attempts to concatenate a numeric value with a number, which is not valid without explicit conversion to a string. Moreover, the use of quotes around
"Discount" is syntactically incorrect in this context.
* Option D: Invalid. The expression expiry_date * 2 attempts to multiply a DATE datatype by a numeric value, which is not a valid operation.
* Option E: Invalid. Similar to Option C, it incorrectly attempts to concatenate a number directly with a numeric value without conversion. Additionally, the aliasing with quotes is incorrectly placed.
* Option F: Valid. This query simply adds two numeric columns (unit_price and surcharge), which is a valid and commonly used arithmetic operation in SQL.
NEW QUESTION # 119
......
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