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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Managing Views | - Create, modify and drop views - Updatable and read-only views | |
| Topic 2: Displaying Data from Multiple Tables | 15% | - Self-joins and outer joins - Cartesian products - Equijoins and non-equijoins |
| Topic 3: Using Single-Row Functions to Customize Output | 20% | - Nested functions usage - Character, number, and date functions |
| Topic 4: Using Data Dictionary Views | - Retrieve metadata and object information | |
| Topic 5: Working with Time Zones and Date/Time Data | - Time zone conversion functions - TIMESTAMP, INTERVAL data types | |
| Topic 6: Restricting and Sorting Data | 15% | - Substitution variables, DEFINE and VERIFY commands - Operator precedence - ORDER BY clause and sorting rules - WHERE clause and filtering conditions |
| Topic 7: Managing Tables and Constraints | - Data types, creating/altering/dropping tables - Constraints: primary key, foreign key, unique, check, not null - Temporary and external tables | |
| Topic 8: Aggregating Data Using Group Functions | 10% | - Handling NULLs in group functions - GROUP BY and HAVING clauses - SUM, AVG, COUNT, MAX, MIN functions |
| Topic 9: Relational Database Concepts | 10% | - Theoretical and physical aspects of relational databases - Relationship between database and SQL - ERD and SQL statement mapping |
| Topic 10: Retrieving Data Using SQL SELECT Statement | 20% | - Column aliases, concatenation, literals and DISTINCT - SELECT statement syntax and usage - Arithmetic operations and NULL handling |
| Topic 11: Using Subqueries to Solve Queries | - Single-row and multi-row subqueries - Correlated subqueries for update/delete | |
| Topic 12: Managing Indexes, Synonyms and Sequences | - Create and use synonyms - Create and use sequences - Create and maintain indexes | |
| Topic 13: Using SET Operators | - UNION, UNION ALL, INTERSECT, MINUS operators - Ordering results with set operations | |
| Topic 14: Manipulating Data and Managing Transactions | - Transaction control: COMMIT, ROLLBACK, SAVEPOINT - INSERT, UPDATE, DELETE, MERGE statements - Multi-table inserts | |
| Topic 15: Controlling User Access | - Roles, granting and revoking privileges - System and object privileges | |
| Topic 16: 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 |
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NEW QUESTION # 31
Table ORDER_ITEMS contains columns ORDER_TO, UNIT_PRICE and QUANTITY, of data type NUMBER.
Examine these SQL statements:
Statement 1:
Statement 2:
Which two statements are true? (Choose two.)
Answer: A,B
Explanation:
https://stackoverflow.com/questions/12366390/how-to-select-product-that-have-the-maximum-price-of-each-category
NEW QUESTION # 32
User HRhas CREATE SESSION, CREATE ANY TABLEand UNLIMITED TABLESPACEprivileges.
User SCOTThas CREATE SESSION, CREATE TABLEand UNLIMITED TABLESPACEprivileges.
HRsuccessfully executes this statement:
HRattempts to execute:
1. INSERT INTO scott.products VALUES (1, 'LAPTOP');
SCOTTattempts to execute:
2. SELECT * FROM products;
3. INSERT INTO scott.products VALUES (2, 'HDD');
4. CREATE SYNONYM prod FOR products;
Which will execute successfully?
Answer: C
NEW QUESTION # 33
View the exhibit and examine the structures of the EMPLOYEESand DEPARTMENTStables.
You want to update EMPLOYEEStable as follows:
* Update only those employees who work in Boston or Seattle (locations 2900 and 2700).
* Set department_idfor these employees to the department_idcorresponding to London (location_id
2100).
* Set the employees' salary in location_id2100 to 1.1 times the average salary of their department.
* Set the employees' commission in location_id2100 to 1.5 times the average commission of their department.
You issue the following command:
What is outcome?
Answer: A
NEW QUESTION # 34
Examine the structure of the DEPARTMENTS table.
You execute the following command:
Which two statements are true?
Answer: D,E
NEW QUESTION # 35
Which statement fails to execute successfully?
Answer: D
Explanation:
In Oracle SQL, when performing a JOIN operation, the ON clause is used to specify the condition that relates the two tables being joined. The WHERE clause can be used to further filter the result set.
A) This is a valid join condition using the WHERE clause to filter the rows after the join has been made.
B) This statement will fail because the ON clause should only contain conditions that relate the two tables. The condition for filtering the departments table should be in the WHERE clause, not in the ON clause. This is a common mistake when writing JOIN statements.
C) This is a correct statement. The ON clause specifies how the tables are related and the WHERE clause specifies an additional filtering condition for the query.
D) This statement is also correct. It's similar to the first statement (A) and properly places the department_id filter in the ON clause, which is acceptable though not typically best practice as it can be less readable than using a WHERE clause for non-join conditions.
When the JOIN operation is executed, the database first pairs rows from the joined tables that meet the join condition specified by the ON clause. Then, it filters the result of the JOIN operation based on the condition specified in the WHERE clause.
Reference:
Oracle Documentation on Joins: https://docs.oracle.com/database/121/SQLRF/queries006.htm#SQLRF52359
NEW QUESTION # 36
......
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