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| Section | Weight | Objectives |
|---|---|---|
| Managing Tables and Constraints | - Constraints: primary key, foreign key, unique, check, not null - Temporary and external tables - Data types, creating/altering/dropping tables | |
| Manipulating Data and Managing Transactions | - Multi-table inserts - INSERT, UPDATE, DELETE, MERGE statements - Transaction control: COMMIT, ROLLBACK, SAVEPOINT | |
| Restricting and Sorting Data | 15% | - ORDER BY clause and sorting rules - Operator precedence - WHERE clause and filtering conditions - Substitution variables, DEFINE and VERIFY commands |
| Managing Indexes, Synonyms and Sequences | - Create and use synonyms - Create and maintain indexes - Create and use sequences | |
| Displaying Data from Multiple Tables | 15% | - Equijoins and non-equijoins - Self-joins and outer joins - Cartesian products |
| 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 |
| Using Data Dictionary Views | - Retrieve metadata and object information | |
| Managing Views | - Create, modify and drop views - Updatable and read-only views | |
| Using Subqueries to Solve Queries | - Single-row and multi-row subqueries - Correlated subqueries for update/delete | |
| Using SET Operators | - Ordering results with set operations - UNION, UNION ALL, INTERSECT, MINUS operators | |
| Using Single-Row Functions to Customize Output | 20% | - Nested functions usage - Character, number, and date functions |
| Retrieving Data Using SQL SELECT Statement | 20% | - Column aliases, concatenation, literals and DISTINCT - SELECT statement syntax and usage - Arithmetic operations and NULL handling |
| Controlling User Access | - Roles, granting and revoking privileges - System and object privileges | |
| Aggregating Data Using Group Functions | 10% | - Handling NULLs in group functions - GROUP BY and HAVING clauses - SUM, AVG, COUNT, MAX, MIN functions |
| Working with Time Zones and Date/Time Data | - TIMESTAMP, INTERVAL data types - Time zone conversion functions | |
| Relational Database Concepts | 10% | - Relationship between database and SQL - Theoretical and physical aspects of relational databases - ERD and SQL statement mapping |
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NEW QUESTION # 375
View the Exhibit and examine the structure of the PRODUCTS table. (Choose the best answer.)
You must display the category with the maximum number of items.
You issue this query:
SQL > SELECT COUNT(*), prod_category_id
FROM products
GROUP BY prod_category_id
HAVING COUNT(*) = (SELECT MAX(COUNT(*)) FROM porducts);
What is the result?
Answer: D
NEW QUESTION # 376
Examine the structure of the MEMBERS table: (Choose the best answer.)
Examine the SQL statement:
SQL > SELECT city, last_name LNAME FROM MEMBERS ORDER BY 1, LNAME DESC; What would be the result execution?
Answer: D
NEW QUESTION # 377
View the Exhibit and examine the description of the tables.
You execute this SQL statement:
Which three statements are true? (Choose three.)
Answer: B,C,D
NEW QUESTION # 378
Examine the structure of the EMPLOYEES table.
You must display the details of employees who have manager with MANAGER_ID 100, who were hired in the past 6 months and who have salaries greater than 10000.
Which query would retrieve the required result?
Answer: D
NEW QUESTION # 379
You and your colleague Andrew have these privileges on the EMPLOYEE_RECORDS table:
1. SELECT
2. INSERT
3. UPDATE
4. DELETE
You connect to the database instance an perform an update to some of the rows in
EMPLOYEE_RECORDS, but don't commit yet.
Andrew connects to the database instance and queries the table
No othet user are accessing the table
Which two statements ate true at this point?
Answer: B,D
NEW QUESTION # 380
......
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