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| Section | Weight | Objectives |
|---|---|---|
| Conversion Functions and Conditional Expressions | 10% | - Implicit and explicit data type conversion - NVL, NULLIF, COALESCE and CASE expressions - TO_CHAR, TO_NUMBER, TO_DATE functions |
| Using Single-Row Functions to Customize Output | 20% | - Character, number, and date functions - Nested functions usage |
| Restricting and Sorting Data | 15% | - Substitution variables, DEFINE and VERIFY commands - Operator precedence - ORDER BY clause and sorting rules - WHERE clause and filtering conditions |
| Managing Views | - Updatable and read-only views - Create, modify and drop views | |
| Manipulating Data and Managing Transactions | - Multi-table inserts - INSERT, UPDATE, DELETE, MERGE statements - Transaction control: COMMIT, ROLLBACK, SAVEPOINT | |
| Using SET Operators | - UNION, UNION ALL, INTERSECT, MINUS operators - Ordering results with set operations | |
| Using Data Dictionary Views | - Retrieve metadata and object information | |
| Aggregating Data Using Group Functions | 10% | - SUM, AVG, COUNT, MAX, MIN functions - Handling NULLs in group functions - GROUP BY and HAVING clauses |
| Managing Tables and Constraints | - Constraints: primary key, foreign key, unique, check, not null - Data types, creating/altering/dropping tables - Temporary and external tables | |
| Managing Indexes, Synonyms and Sequences | - Create and use synonyms - Create and maintain indexes - Create and use sequences | |
| Using Subqueries to Solve Queries | - Correlated subqueries for update/delete - Single-row and multi-row subqueries | |
| Working with Time Zones and Date/Time Data | - Time zone conversion functions - TIMESTAMP, INTERVAL data types | |
| Relational Database Concepts | 10% | - Theoretical and physical aspects of relational databases - Relationship between database and SQL - ERD and SQL statement mapping |
| Controlling User Access | - System and object privileges - Roles, granting and revoking privileges | |
| Displaying Data from Multiple Tables | 15% | - Self-joins and outer joins - Equijoins and non-equijoins - Cartesian products |
| Retrieving Data Using SQL SELECT Statement | 20% | - Arithmetic operations and NULL handling - SELECT statement syntax and usage - Column aliases, concatenation, literals and DISTINCT |
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NEW QUESTION # 26
Which statement is true about transactions?
Answer: C
Explanation:
Explanation
https://docs.oracle.com/database/121/CNCPT/transact.htm#CNCPT038
NEW QUESTION # 27
Which two statements are true about the DUAL table?
Answer: C,D
Explanation:
A). Incorrect. DUAL consists of a single row and column. B. Incorrect. DUAL is a special one-row, one-column table present by default in all Oracle database installations and can be accessed by any user with SELECT privilege. C. Correct. Any user with the SELECT privilege can select from the DUAL table. It is a dummy table used primarily for selecting a constant, pseudocolumn, or expression not involving any tables. D.
Incorrect. DUAL has only one row and one column. E. Correct. The DUAL table has a single VARCHAR2 column called DUMMY, which has a value of 'X'. F. Incorrect. DUAL can be used for a variety of purposes, such as selecting system constants, user environment variables, expressions, and sequences.
This information is detailed in the Oracle Database SQL Language Reference, which describes the properties and uses of the DUAL table.
NEW QUESTION # 28
Refer to the exhibit.
Which two queries only return CUBE?
Answer: A,B
NEW QUESTION # 29
Which two are SQL features?
Answer: C,D
NEW QUESTION # 30
View the Exhibit and examine the structure in the DEPARTMENTS tables. (Choose two.)
Examine this SQL statement:
SELECT department_id "DEPT_ID", department_name, 'b' FROM
departments
WHERE departments_id=90
UNION
SELECT department_id, department_name DEPT_NAME, 'a' FROM
departments
WHERE department_id=10
Which two ORDER BY clauses can be used to sort the output?
Answer: B,C
NEW QUESTION # 31
......
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