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| Section | Weight | Objectives |
|---|---|---|
| Using Single-Row Functions to Customize Output | 20% | - Character, number, and date functions - Nested functions usage |
| Using Data Dictionary Views | - Retrieve metadata and object information | |
| Managing Tables and Constraints | - Constraints: primary key, foreign key, unique, check, not null - Temporary and external tables - Data types, creating/altering/dropping tables | |
| Retrieving Data Using SQL SELECT Statement | 20% | - Column aliases, concatenation, literals and DISTINCT - SELECT statement syntax and usage - Arithmetic operations and NULL handling |
| Managing Indexes, Synonyms and Sequences | - Create and use synonyms - Create and use sequences - Create and maintain indexes | |
| Relational Database Concepts | 10% | - ERD and SQL statement mapping - Theoretical and physical aspects of relational databases - Relationship between database and SQL |
| Using SET Operators | - UNION, UNION ALL, INTERSECT, MINUS operators - Ordering results with set operations | |
| Restricting and Sorting Data | 15% | - Substitution variables, DEFINE and VERIFY commands - WHERE clause and filtering conditions - Operator precedence - ORDER BY clause and sorting rules |
| Displaying Data from Multiple Tables | 15% | - Cartesian products - Equijoins and non-equijoins - Self-joins and outer joins |
| Controlling User Access | - System and object privileges - Roles, granting and revoking privileges | |
| Using Subqueries to Solve Queries | - Correlated subqueries for update/delete - Single-row and multi-row subqueries | |
| Conversion Functions and Conditional Expressions | 10% | - Implicit and explicit data type conversion - NVL, NULLIF, COALESCE and CASE expressions - TO_CHAR, TO_NUMBER, TO_DATE functions |
| Managing Views | - Create, modify and drop views - Updatable and read-only views | |
| Manipulating Data and Managing Transactions | - Transaction control: COMMIT, ROLLBACK, SAVEPOINT - Multi-table inserts - INSERT, UPDATE, DELETE, MERGE statements | |
| Aggregating Data Using Group Functions | 10% | - SUM, AVG, COUNT, MAX, MIN functions - Handling NULLs in group functions - GROUP BY and HAVING clauses |
| Working with Time Zones and Date/Time Data | - TIMESTAMP, INTERVAL data types - Time zone conversion functions |
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NEW QUESTION # 282
Examine the data in the EMP table:
You execute this query:
SELECT deptno AS "Department", AVG(sal) AS AverageSalary, MAX(sal) AS "Max Salary" FROM emp WHERE sal >= 12000 GROUP BY "Department " ORDER BY AverageSalary; Why does an error occur?
Answer: C
NEW QUESTION # 283
You want to write a query that prompts for two column names and the WHERE condition each time it is executed in a session but only prompts for the table name the first time it is executed.
The variables used in your query are never undefined in your session?
Which query can be used?
Answer: C
NEW QUESTION # 284
View the Exhibit and examine the data in the PRODUCT_INFORMATIONtable.
Which two tasks would require subqueries? (Choose two.)
Answer: A,E
NEW QUESTION # 285
Which two statements are true regarding constraints? (Choose two.)
Answer: B,D
NEW QUESTION # 286
Which three statements are true about the ALTER TABLE....DROP COLUMN....command?
Answer: A,B,E
NEW QUESTION # 287
......
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