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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Working with Time Zones and Date/Time Data | - TIMESTAMP, INTERVAL data types - Time zone conversion functions | |
| Topic 2: Using Data Dictionary Views | - Retrieve metadata and object information | |
| Topic 3: Managing Tables and Constraints | - Temporary and external tables - Data types, creating/altering/dropping tables - Constraints: primary key, foreign key, unique, check, not null | |
| Topic 4: Restricting and Sorting Data | 15% | - WHERE clause and filtering conditions - Substitution variables, DEFINE and VERIFY commands - Operator precedence - ORDER BY clause and sorting rules |
| Topic 5: Displaying Data from Multiple Tables | 15% | - Cartesian products - Equijoins and non-equijoins - Self-joins and outer joins |
| Topic 6: Using Subqueries to Solve Queries | - Correlated subqueries for update/delete - Single-row and multi-row subqueries | |
| Topic 7: Using SET Operators | - Ordering results with set operations - UNION, UNION ALL, INTERSECT, MINUS operators | |
| Topic 8: Conversion Functions and Conditional Expressions | 10% | - Implicit and explicit data type conversion - TO_CHAR, TO_NUMBER, TO_DATE functions - NVL, NULLIF, COALESCE and CASE expressions |
| Topic 9: Managing Views | - Updatable and read-only views - Create, modify and drop views | |
| Topic 10: Manipulating Data and Managing Transactions | - Transaction control: COMMIT, ROLLBACK, SAVEPOINT - INSERT, UPDATE, DELETE, MERGE statements - Multi-table inserts | |
| Topic 11: Relational Database Concepts | 10% | - Theoretical and physical aspects of relational databases - Relationship between database and SQL - ERD and SQL statement mapping |
| Topic 12: Managing Indexes, Synonyms and Sequences | - Create and maintain indexes - Create and use synonyms - Create and use sequences | |
| Topic 13: Aggregating Data Using Group Functions | 10% | - SUM, AVG, COUNT, MAX, MIN functions - GROUP BY and HAVING clauses - Handling NULLs in group functions |
| Topic 14: Controlling User Access | - Roles, granting and revoking privileges - System and object privileges | |
| Topic 15: Using Single-Row Functions to Customize Output | 20% | - Nested functions usage - Character, number, and date functions |
| Topic 16: Retrieving Data Using SQL SELECT Statement | 20% | - Arithmetic operations and NULL handling - Column aliases, concatenation, literals and DISTINCT - SELECT statement syntax and usage |
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NEW QUESTION # 195
Examine the description of the ENPLYEES table:
Which two queries return all rows for employees whose salary is greater than the average salary in their department?
Answer: A,E
NEW QUESTION # 196
Examine the description of the EMPLOYEES table:
NLS_DATE_FORMAT is set to DD-MON-YY.
Which query requires explicit data type conversion?
Answer: E
NEW QUESTION # 197
View the Exhibit and examine the structure of the PRODUCTS table. Which two tasks require subqueries?
Answer: A,C
NEW QUESTION # 198
Examine the structure proposed for the TRANSACTIONS table:
Which two statements are true regarding the storage of data in the above table structure? (Choose two.)
Answer: A,D
NEW QUESTION # 199
You execute these commands:
SQL> DEFINE hiredate = '01-APR -2011';
SQL> SELECT employee_id, first_name, salary FROM employees WHERE hire date > &hiredate AND manager_id >&mgr_id; For which substitution variables will you be prompted?
Answer: B
Explanation:
* D. only &mgr_id: Since the hiredate variable is already defined before the SELECT statement, you will not be prompted for &hiredate again. However, &mgr_id has not been defined, so you will be prompted for this substitution variable.
NEW QUESTION # 200
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