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| Section | Weight | Objectives |
|---|---|---|
| Using DDL Statements to Create and Manage Tables | 14% | - Categorize the main database objects - Drop, rename, and truncate tables - Describe the data types that are available for columns - Create a simple table - Alter table definitions - Review the table structure |
| Manipulating Data | 14% | - Update rows in a table - Insert rows into a table - Control transactions - Describe each data manipulation language (DML) statement - Delete rows from a table |
| Using Set Operators | 5% | - Use a set operator to combine multiple queries into a single query - Describe set operators - Describe the order of precedence when the set operators are used |
| Restricting and Sorting Data | 6% | - Use ampersand substitution to restrict and sort output at runtime - Limit the rows that are retrieved by a query - Use DEFINE and UNDEFINE commands - Sort the rows that are retrieved by a query |
| 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 |
| Using Single-Row Functions to Customize Output | 10% | - 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 - Manipulate strings with character function in the SELECT and WHERE clauses |
| Using Subqueries to Solve Queries | 15% | - List the types of subqueries - Define subqueries - Describe the types of problems that subqueries can solve - Write single-row and multi-row subqueries |
| Using Conversion Functions and Conditional Expressions | 10% | - Use the TO_CHAR, TO_NUMBER, and TO_DATE conversion functions - Use conditional IF THEN ELSE logic in a SELECT statement - Describe implicit and explicit data type conversion - Apply the NVL, NULLIF, and COALESCE functions to data |
| Creating Other Schema Objects | 10% | - Create and maintain indexes - Create synonyms for database objects - Create, modify, and retrieve data from a view - Create, maintain, and use sequences |
| Working with Oracle Database SQL | 8% | - Describe the Oracle Database architecture - Start up and shut down a database - Create a container database - Explain the installation of Oracle Database software |
| Retrieving Data Using the SQL SELECT Statement | 5% | - Execute a basic SELECT statement - Differentiate between SQL statements and SQL*Plus commands - List the capabilities of SQL SELECT statements |
| Reporting Aggregated Data Using Group Functions | 15% | - Describe the use of group functions - Group data by using the GROUP BY clause - Identify the available group functions - Include or exclude grouped rows by using the HAVING clause |
| Controlling User Access | 5% | - Grant privileges on tables and on a view - Distinguish between granting privileges and roles - Differentiate system privileges from object privileges |
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NEW QUESTION # 384
View the Exhibit and examine the structure of the CUSTOMERS and CUST_HISTORY tables.
The CUSTOMERS table contains the current location of all currently active customers.
The CUST_HISTORY table stores historical details relating to any changes in the location of all current as well as previous customers who are no longer active with the company.
You need to find those customers who have never changed their address.
Which SET operator would you use to get the required output?
Answer: D
NEW QUESTION # 385
Which three statements are true about views in an Oracle database?
Answer: B,C,F
Explanation:
A view is a virtual table based on a SQL query.
A: This is incorrect because a SELECT statement querying a view can contain a WHERE clause, regardless of the view's defining query. C. This is incorrect because views can join tables from different schemas, not just the same schema. B. Correct. The rows inserted into a base table via a view remain in the table even if the view is dropped because the view is just a window to the data in the base tables. D. Correct. Views do not require storage space other than for the definition of the view in the data dictionary, hence they have no segment. E. Incorrect. Views do not have object numbers because they are not database objects that occupy physical space. F. Correct. You can create a view that references non-existent tables; such a view would be considered invalid until the base table is created.
The Oracle Database Concepts guide provides information about views and their characteristics.
NEW QUESTION # 386
Examine this statement which executes successfully:
Which three are true?
Answer: A,C,D
NEW QUESTION # 387
View the exhibit and examine the description of the DEPARTMENTS and EMPLOYEES tables.
You wrote this SQL statement to retrieve EMPLOYEE_ID, FIRST_NAME, and DEPARTMENT NAME, for all employees:
SELECT employee_id, first_name, department_name
FROM employees
NATURAL JOIN departments;
The desired output is not obtained after executing the above SQL statement. What could be the reason for this?
Answer: A
Explanation:
Explanation
Natural join needs only one column to be the same in each table. The EMPLOYEES and DEPARTMENTS tables have two columns that are the same (Department_ID and Manager_ID)
NEW QUESTION # 388
Which statement is true about aggregate functions?
Answer: A
NEW QUESTION # 389
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