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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Managing Tables and Constraints | - Temporary and external tables - Constraints: primary key, foreign key, unique, check, not null - Data types, creating/altering/dropping tables | |
| Topic 2: Managing Views | - Create, modify and drop views - Updatable and read-only views | |
| Topic 3: Restricting and Sorting Data | 15% | - WHERE clause and filtering conditions - Operator precedence - ORDER BY clause and sorting rules - Substitution variables, DEFINE and VERIFY commands |
| Topic 4: Controlling User Access | - System and object privileges - Roles, granting and revoking privileges | |
| Topic 5: Conversion Functions and Conditional Expressions | 10% | - TO_CHAR, TO_NUMBER, TO_DATE functions - NVL, NULLIF, COALESCE and CASE expressions - Implicit and explicit data type conversion |
| Topic 6: Displaying Data from Multiple Tables | 15% | - Equijoins and non-equijoins - Self-joins and outer joins - Cartesian products |
| Topic 7: Using Data Dictionary Views | - Retrieve metadata and object information | |
| Topic 8: Using Single-Row Functions to Customize Output | 20% | - Nested functions usage - Character, number, and date functions |
| Topic 9: Using SET Operators | - Ordering results with set operations - UNION, UNION ALL, INTERSECT, MINUS operators | |
| Topic 10: Using Subqueries to Solve Queries | - Correlated subqueries for update/delete - Single-row and multi-row subqueries | |
| Topic 11: Relational Database Concepts | 10% | - ERD and SQL statement mapping - Theoretical and physical aspects of relational databases - Relationship between database and SQL |
| Topic 12: Working with Time Zones and Date/Time Data | - TIMESTAMP, INTERVAL data types - Time zone conversion functions | |
| Topic 13: Managing Indexes, Synonyms and Sequences | - Create and use synonyms - Create and maintain indexes - Create and use sequences | |
| Topic 14: Retrieving Data Using SQL SELECT Statement | 20% | - SELECT statement syntax and usage - Column aliases, concatenation, literals and DISTINCT - Arithmetic operations and NULL handling |
| Topic 15: Manipulating Data and Managing Transactions | - Multi-table inserts - Transaction control: COMMIT, ROLLBACK, SAVEPOINT - INSERT, UPDATE, DELETE, MERGE statements | |
| Topic 16: Aggregating Data Using Group Functions | 10% | - SUM, AVG, COUNT, MAX, MIN functions - GROUP BY and HAVING clauses - Handling NULLs in group functions |
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NEW QUESTION # 167
Examine the following query:
SQL> SELECT prod_id, amount_sold
FROM sales
ORDER BY amount_sold
FETCH FIRST 5 PERCENT ROWS ONLY;
What is the output of this query?
Answer: C
Explanation:
Explanation/Reference:
References:
https://oracle-base.com/articles/12c/row-limiting-clause-for-top-n-queries-12cr1
NEW QUESTION # 168
View the Exhibit and examine the structure of ORDERS and CUSTOMERS tables.
(Choose the best answer.)
You executed this UPDATE statement:
UPDATE
( SELECT order_date, order_total, customer_id FROM orders)
Set order_date = '22-mar-2007'
WHERE customer_id IN
(SELECT customer_id FROM customers
WHERE cust_last_name = 'Roberts' AND credit_limit = 600);
Which statement is true regarding the execution?
Answer: C
NEW QUESTION # 169
Which two statements are true about a self join?
Answer: A,D
Explanation:
Explanation/Reference: https://www.oracletutorial.com/oracle-basics/oracle-self-join/
NEW QUESTION # 170
Which statement is true regarding external tables?
Answer: D
NEW QUESTION # 171
Which three statements are true about inner and outer joins?
Answer: B,C,F
NEW QUESTION # 172
......
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