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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Using Single-Row Functions to Customize Output | 20% | - Nested functions usage - Character, number, and date functions |
| Topic 2: Conversion Functions and Conditional Expressions | 10% | - NVL, NULLIF, COALESCE and CASE expressions - Implicit and explicit data type conversion - TO_CHAR, TO_NUMBER, TO_DATE functions |
| Topic 3: Retrieving Data Using SQL SELECT Statement | 20% | - SELECT statement syntax and usage - Column aliases, concatenation, literals and DISTINCT - Arithmetic operations and NULL handling |
| Topic 4: Manipulating Data and Managing Transactions | - INSERT, UPDATE, DELETE, MERGE statements - Transaction control: COMMIT, ROLLBACK, SAVEPOINT - Multi-table inserts | |
| Topic 5: Controlling User Access | - Roles, granting and revoking privileges - System and object privileges | |
| Topic 6: Managing Tables and Constraints | - Data types, creating/altering/dropping tables - Temporary and external tables - Constraints: primary key, foreign key, unique, check, not null | |
| Topic 7: Using Subqueries to Solve Queries | - Single-row and multi-row subqueries - Correlated subqueries for update/delete | |
| Topic 8: Displaying Data from Multiple Tables | 15% | - Equijoins and non-equijoins - Self-joins and outer joins - Cartesian products |
| Topic 9: Restricting and Sorting Data | 15% | - Operator precedence - WHERE clause and filtering conditions - ORDER BY clause and sorting rules - Substitution variables, DEFINE and VERIFY commands |
| Topic 10: Working with Time Zones and Date/Time Data | - TIMESTAMP, INTERVAL data types - Time zone conversion functions | |
| Topic 11: Relational Database Concepts | 10% | - Relationship between database and SQL - Theoretical and physical aspects of relational databases - ERD and SQL statement mapping |
| Topic 12: Using Data Dictionary Views | - Retrieve metadata and object information | |
| Topic 13: Using SET Operators | - Ordering results with set operations - UNION, UNION ALL, INTERSECT, MINUS operators | |
| Topic 14: Managing Indexes, Synonyms and Sequences | - Create and use sequences - Create and maintain indexes - Create and use synonyms | |
| Topic 15: Managing Views | - Updatable and read-only views - Create, modify and drop views | |
| Topic 16: Aggregating Data Using Group Functions | 10% | - SUM, AVG, COUNT, MAX, MIN functions - Handling NULLs in group functions - GROUP BY and HAVING clauses |
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NEW QUESTION # 161
Evaluate the following CREATE TABLE command:
Which statement is true regarding the above SQL statement?
Answer: A
NEW QUESTION # 162
Which statement will return a comma-separated list of employee names in alphabetical order for each department in the EMP table?
Answer: B
Explanation:
The LISTAGG function is used in Oracle to aggregate strings from data in a group specified by the GROUP BY clause, producing a single row of concatenated values. The correct syntax also specifies an ORDER BY clause within the WITHIN GROUP parenthesis to sort the values in the concatenated list.
The correct query is:
SELECT deptno, LISTAGG(ename, ', ') WITHIN GROUP (ORDER BY ename) AS employee_list FROM emp GROUP BY deptno; This statement will return a comma-separated list of employee names (ename) in alphabetical order for each department (deptno) in the EMP table.
NEW QUESTION # 163
View the exhibit and examine the structure and data in the invoice table. (Choose two.) Which two SQL statements would execute successfully?
Answer: B,D
NEW QUESTION # 164
Which two are true about external tables that use the ORACLE _DATAPUMP access driver?
Answer: A,D
NEW QUESTION # 165
Evaluate the following statement.
Which statement is true regarding the evaluation of rows returned by the subquery in the INSERT statement?
Answer: A
NEW QUESTION # 166
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