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| Section | Weight | Objectives |
|---|---|---|
| Using Conversion Functions and Conditional Expressions | 10% | - Describe implicit and explicit data type conversion - Use conditional IF THEN ELSE logic in a SELECT statement - Apply the NVL, NULLIF, and COALESCE functions to data - Use the TO_CHAR, TO_NUMBER, and TO_DATE conversion functions |
| 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 DDL Statements to Create and Manage Tables | 14% | - Drop, rename, and truncate tables - Alter table definitions - Review the table structure - Categorize the main database objects - Create a simple table - Describe the data types that are available for columns |
| Restricting and Sorting Data | 6% | - Limit the rows that are retrieved by a query - Sort the rows that are retrieved by a query - Use ampersand substitution to restrict and sort output at runtime - Use DEFINE and UNDEFINE commands |
| Displaying Data from Multiple Tables Using Joins | 15% | - Join a table to itself by using a self-join - View data that does not meet a join condition by using outer joins - Cross join tables - Write SELECT statements to access data from more than one table using equijoins and non-equijoins |
| Working with Oracle Database SQL | 8% | - Describe the Oracle Database architecture - Create a container database - Explain the installation of Oracle Database software - Start up and shut down a database |
| Using Subqueries to Solve Queries | 15% | - Write single-row and multi-row subqueries - Describe the types of problems that subqueries can solve - Define subqueries - List the types of subqueries |
| Retrieving Data Using the SQL SELECT Statement | 5% | - Execute a basic SELECT statement - List the capabilities of SQL SELECT statements - Differentiate between SQL statements and SQL*Plus commands |
| Creating Other Schema Objects | 10% | - Create, maintain, and use sequences - Create and maintain indexes - Create synonyms for database objects - Create, modify, and retrieve data from a view |
| Reporting Aggregated Data Using Group Functions | 15% | - Identify the available group functions - Include or exclude grouped rows by using the HAVING clause - Describe the use of group functions - Group data by using the GROUP BY clause |
| Manipulating Data | 14% | - Update rows in a table - Delete rows from a table - Control transactions - Describe each data manipulation language (DML) statement - Insert rows into a table |
| 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 Single-Row Functions to Customize Output | 10% | - Manipulate strings with character function in the SELECT and WHERE clauses - Manipulate dates with the date functions - Perform arithmetic with date data - Describe the differences between single-row and multiple-row functions - Manipulate numbers with the ROUND, TRUNC, and MOD functions |
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NEW QUESTION # 20
Which three statements are true?
Answer: A,B,D
Explanation:
* A. A customer can exist in many countries. This is true as customers can have multiple addresses or operations in different countries, and a database design can reflect this by allowing multiple country entries for a single customer1.
* C. The statement will fail because subquery may not be I contained in a values clause. In Oracle Database 12c, a subquery cannot be used within the VALUES clause of an INSERT statement. The correct approach would be to use the subquery in conjunction with the INSERT INTO ... SELECT syntax if multiple rows are derived from a subquery2.
* F. A product can have a different unit price at different times. It is common for products to have different unit prices at different times due to various factors such as promotions, discounts, or changes in cost price. This can be represented in a database by having a price history table or a similar mechanism to track the changes in price over time1.
Note: The other options are incorrect because:
* B. The statement about the SALES table failing if a row already exists for product 23 is not necessarily true. Oracle allows for multiple rows with the same product ID if the table is designed to handle such cases, like having a composite primary key or no constraints preventing duplicates.
* D. Without specific information about the SALES table's design, we cannot verify the number of foreign keys it has.
* E. The statement about the successful execution and insertion of a new row into the SALES table is too vague without the context of the actual SQL statement being referred to.
NEW QUESTION # 21
You are designing the structure of a table in which two columns have the specifications:
COMPONENT_ID - must be able to contain a maximum of 12 alphanumeric
characters and uniquely identify the row
EXECUTION_DATETIME - contains Century, Year, Month, Day, Hour, Minute,
Second to the maximum precision and is used for calculations and
comparisons between components.
Which two options define the data types that satisfy these requirements most efficiently?
Answer: A,D
NEW QUESTION # 22
Examine the description of the EMPLOYEES table:
Which query requires explicit data type conversion?
Answer: E
NEW QUESTION # 23
In the EMPLOYEES table there are 1000 rows and employees are working in the company for more than 10 years.
Evaluate the following SQL statement:
What would be the result?
Answer: D
NEW QUESTION # 24
Which three statements are true about GLOBAL TEMPORARY TABLES? (Choose three.)
Answer: A,C,F
NEW QUESTION # 25
......
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