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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Using DDL Statements to Create and Manage Tables | 14% | - Alter table definitions - Review the table structure - Categorize the main database objects - Describe the data types that are available for columns - Create a simple table - Drop, rename, and truncate tables |
| Topic 2: 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 |
| Topic 3: Controlling User Access | 5% | - Grant privileges on tables and on a view - Differentiate system privileges from object privileges - Distinguish between granting privileges and roles |
| Topic 4: 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 |
| Topic 5: Creating Other Schema Objects | 10% | - Create synonyms for database objects - Create, maintain, and use sequences - Create, modify, and retrieve data from a view - Create and maintain indexes |
| Topic 6: 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 |
| Topic 7: 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 |
| Topic 8: 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 |
| Topic 9: Displaying Data from Multiple Tables Using Joins | 15% | - Cross join tables - Write SELECT statements to access data from more than one table using equijoins and non-equijoins - Join a table to itself by using a self-join - View data that does not meet a join condition by using outer joins |
| Topic 10: Using Single-Row Functions to Customize Output | 10% | - Manipulate numbers with the ROUND, TRUNC, and MOD functions - Perform arithmetic with date data - Describe the differences between single-row and multiple-row functions - Manipulate strings with character function in the SELECT and WHERE clauses - Manipulate dates with the date functions |
| Topic 11: Manipulating Data | 14% | - Describe each data manipulation language (DML) statement - Delete rows from a table - Control transactions - Insert rows into a table - Update rows in a table |
| Topic 12: 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 |
| Topic 13: Working with Oracle Database SQL | 8% | - Explain the installation of Oracle Database software - Create a container database - Start up and shut down a database - Describe the Oracle Database architecture |
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NEW QUESTION # 143
Evaluate the following SQL statement:
SELECT product_name || 'it's not available for order'
FROM product_information
WHERE product_status = 'obsolete';
You received the following error while executing the above query:
ERROR:
ORA-01756: quoted string not properly terminated
What would you do to execute the query successfully?
Answer: D
NEW QUESTION # 144
Examine these statements and results:
How many rows are retrieved by the last query?
Answer: A
NEW QUESTION # 145
Examine the description of the EMPLOYEES table:
NLS_DATE FORMAT is DD-MON-RR.
Which two queries will execute successfully?
Answer: D
Explanation:
In Oracle SQL, aggregation functions such as AVG and MAX cannot be nested directly inside each other and must be used in conjunction with GROUP BY on the column(s) that are not included in the aggregate function. Also, the HAVING clause filters groups after aggregation is applied.
A . This query will not execute successfully because it improperly nests MAX inside AVG. Oracle SQL does not allow this type of nested aggregation without a subquery.
B . This query will not execute successfully for the same reason as A, it improperly nests MAX inside AVG.
C . Similar to A and B, this query improperly nests SUM inside MAX, which is not allowed without a subquery.
D . This query will execute successfully. It filters rows based on the HIRE_DATE using a correct date format (assuming '9' refers to '09' or '1999' due to the NLS_DATE_FORMAT being 'DD-MON-RR'), then groups the remaining rows by DEPT_ID and calculates the sum of SALARY for each department.
E . This query will not execute successfully because it improperly nests MAX inside AVG without a subquery, and it incorrectly attempts to GROUP BY SALARY, which is already being aggregated.
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "Aggregate Functions" Oracle Database SQL Language Reference, 12c Release 1 (12.1): "GROUP BY Clause" Oracle Database SQL Language Reference, 12c Release 1 (12.1): "HAVING Clause"
NEW QUESTION # 146
Examine the description of the ENPLOYES table:
Which query requires explicit data type conversion?
Answer: E
NEW QUESTION # 147
Which three statements about roles are true?
Answer: B,D,F
Explanation:
Roles are named collections of privileges in Oracle databases.
A). False. Roles cannot be assigned to other roles using the ALTER ROLE statement.
B). False. Roles can be assigned to both users and other roles.
C). True. Roles are assigned to users using the ALTER USER statement, but this is not the only method.
D). True. A single role can be assigned to multiple users, simplifying the management of user privileges.
E). True. A single user can be assigned multiple roles.
F). False. Privileges are not assigned to a role using the ALTER ROLE statement.
G). True. Privileges are assigned to a role using the GRANT statement.
NEW QUESTION # 148
......
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