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| Section | Weight | Objectives |
|---|---|---|
| Controlling User Access | 5% | - Differentiate system privileges from object privileges - Distinguish between granting privileges and roles - Grant privileges on tables and on a view |
| Displaying Data from Multiple Tables Using Joins | 15% | - Join a table to itself by using a self-join - Cross join tables - View data that does not meet a join condition by using outer joins - Write SELECT statements to access data from more than one table using equijoins and non-equijoins |
| Creating Other Schema Objects | 10% | - Create synonyms for database objects - Create and maintain indexes - Create, maintain, and use sequences - Create, modify, and retrieve data from a view |
| 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 - Use the TO_CHAR, TO_NUMBER, and TO_DATE conversion functions - Describe implicit and explicit data type conversion |
| Restricting and Sorting Data | 6% | - 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 - Use DEFINE and UNDEFINE commands |
| Using Set Operators | 5% | - Describe the order of precedence when the set operators are used - Describe set operators - Use a set operator to combine multiple queries into a single query |
| Reporting Aggregated Data Using Group Functions | 15% | - Include or exclude grouped rows by using the HAVING clause - Identify the available group functions - Describe the use of group functions - Group data by using the GROUP BY clause |
| Working with Oracle Database SQL | 8% | - Describe the Oracle Database architecture - Explain the installation of Oracle Database software - Start up and shut down a database - Create a container database |
| Using DDL Statements to Create and Manage Tables | 14% | - Create a simple table - Categorize the main database objects - Describe the data types that are available for columns - Alter table definitions - Review the table structure - Drop, rename, and truncate tables |
| 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 |
| Manipulating Data | 14% | - Insert rows into a table - Describe each data manipulation language (DML) statement - Delete rows from a table - Control transactions - Update rows in a table |
| Using Single-Row Functions to Customize Output | 10% | - Perform arithmetic with date data - 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 - Manipulate numbers with the ROUND, TRUNC, and MOD functions |
| Using Subqueries to Solve Queries | 15% | - Write single-row and multi-row subqueries - Describe the types of problems that subqueries can solve - List the types of subqueries - Define subqueries |
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NEW QUESTION # 127
Which two statements are true regarding multiple-row subqueries? (Choose two.)
Answer: A,B
NEW QUESTION # 128
Examine this query:
SELECT employee_id,first_name,salary
FROM employees
WHERE hire_date>'&1';
Which two methods should you use to prevent prompting for a hire date value when this query is executed?
Answer: B,F
NEW QUESTION # 129
Examine this partial command:
Which two clauses are required for this command to execute successfully? (Choose two.)
Answer: B,E
NEW QUESTION # 130
Examine the description of the CUSTONERS table
CUSTON is the PRIMARY KEY.
You must derermine if any customers'derails have entered more than once using a different
costno,by listing duplicate name
Which two methode can you use to get the requlred resuit?
Answer: B,C
NEW QUESTION # 131
Examine this SQL statement:
SELECT cust_id, cus_last_name "Last Name"
FROM customers
WHERE country_id = 10
UNION
SELECT cust_id CUST_NO, cust_last_name
FROM customers
WHERE country_id = 30
Identify three ORDER BY clauses, any one of which can complete the query successfully.
Answer: A,B
Explanation:
In SQL, the ORDER BY clause can refer to columns by their alias defined in the SELECT clause or by their positional number in the SELECT list. It's important to understand that after a UNION, the column names in the ORDER BY clause refer to the first SELECT statement's column names and aliases:
* Option A: ORDER BY 2, 1This is correct because it refers to the second and first columns in the first SELECT clause, which correspond to the aliases "Last Name" and cust_id, respectively.
* Option E: ORDER BY "Last Name"This is correct because "Last Name" is a valid alias defined in the first SELECT clause.
The other options fail for the following reasons:
* Option B: "CUST_NO" is not recognized in the ORDER BY clause because it's not an alias used in the first SELECT statement.
* Option C: Incorrect because 2, cust_id mixes positional reference with a column name that doesn't apply to both SELECT statements consistently.
* Option D: ORDER BY CUST_NO fails because CUST_NO is not an alias in the first SELECT clause.
NEW QUESTION # 132
......
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