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| Section | Weight | Objectives |
|---|---|---|
| Using Subqueries to Solve Queries | 15% | - Describe the types of problems that subqueries can solve - Write single-row and multi-row subqueries - List the types of subqueries - Define subqueries |
| 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 |
| Using Single-Row Functions to Customize Output | 10% | - Manipulate dates with the date functions - Manipulate numbers with the ROUND, TRUNC, and MOD functions - Describe the differences between single-row and multiple-row functions - Perform arithmetic with date data - Manipulate strings with character function in the SELECT and WHERE clauses |
| Manipulating Data | 14% | - Insert rows into a table - Control transactions - Update rows in a table - Delete rows from a table - Describe each data manipulation language (DML) statement |
| Reporting Aggregated Data Using Group Functions | 15% | - Describe the use of group functions - Identify the available group functions - Group data by using the GROUP BY clause - Include or exclude grouped rows by using the HAVING clause |
| 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 |
| Using Conversion Functions and Conditional Expressions | 10% | - Use the TO_CHAR, TO_NUMBER, and TO_DATE conversion functions - 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 |
| 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 |
| Using DDL Statements to Create and Manage Tables | 14% | - Alter table definitions - Drop, rename, and truncate tables - Describe the data types that are available for columns - Create a simple table - Categorize the main database objects - Review the table structure |
| Creating Other Schema Objects | 10% | - Create synonyms for database objects - Create, modify, and retrieve data from a view - Create, maintain, and use sequences - Create and maintain indexes |
| Controlling User Access | 5% | - Differentiate system privileges from object privileges - Distinguish between granting privileges and roles - Grant privileges on tables and on a view |
| 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 |
| Working with Oracle Database SQL | 8% | - Start up and shut down a database - Describe the Oracle Database architecture - Explain the installation of Oracle Database software - Create a container database |
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NEW QUESTION # 398
Refer to the exhibit.
Which two queries execute successfully?
Answer: B,E
NEW QUESTION # 399
You must find the number of employees whose salary is lower than employee 110.
Which statement fails to do this?
Answer: C
Explanation:
In this context, the correct answers will provide a count of employees with a salary less than that of employee with ID 110. Let's evaluate the provided statements:
* A: This statement is incorrect due to a syntax error; it uses alias 'e' without defining it, and 'a' is also used incorrectly in the JOIN clause. It should have been written with proper aliases.
* B: This statement is correct as it uses a subquery to find the salary of employee ID 110 and compares it to the salaries of all employees to get the count.
* C: This statement is also correct as it creates a derived table with the salary of employee ID 110 and compares it with the salaries of the 'employees' table using a JOIN.
* D: This is the statement that fails. It is incorrect because the subquery references 'e.employee_id = 110', which will compare the salary of each employee to themselves if their ID is 110, not to the salary of employee 110 for all employees.
NEW QUESTION # 400
Examine the data in the CUST_NAME column of the CUSTOMERS table.
CUST_NAME
-------------------
Renske Ladwig
Jason Mallin
Samuel McCain
Allan MCEwen
Irene Mikkilineni
Julia Nayer
You need to display customers' second names where the second name starts with "Mc" or "MC".
Which query gives the required output?
Answer: A
NEW QUESTION # 401
Which three statements are true regarding indexes?
Answer: B,C,E
Explanation:
Indexes are structures that can improve the retrieval time of data from a database table and have certain characteristics:
* A. A SELECT statement can access one or more indices without accessing any tables: If the index contains all the columns needed for the query, Oracle can retrieve the data from the index alone without accessing the table. This is known as an index-only scan.
* D. A UNIQUE index can be altered to be non-unique: It is possible to alter a unique index to become non-unique by using the ALTER INDEX command.
* F. An update to a table can result in updates to any or all of the table's indexes: If the updated column is part of one or more indexes, those indexes will need to be updated to reflect the change. If the updated column is not part of an index, then no index update is required.
References:
* Oracle Database SQL Language Reference 12c, especially sections on index management and the behavior of DML operations with respect to indexes.
NEW QUESTION # 402
Examine the description of the EMP_DETAILS table given below:
Which two statements are true regarding SQL statements that can be executed on the EMP_DETAIL TABLE?
Answer: C,D
NEW QUESTION # 403
......
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