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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Controlling User Access | 5% | - System vs object privileges - Granting privileges on tables - Roles creation and privilege assignment |
| Topic 2: Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Topic 3: Data Dictionary and Time Zones | 5% | - INTERVAL data types - Using data dictionary views - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP |
| Topic 4: Managing Indexes, Synonyms, Sequences | 5% | - Create and manage synonyms - Create and manage sequences - Create and manage indexes |
| Topic 5: Retrieving and Sorting Data | 15% | - DEFINE and VERIFY commands - Sorting query results - Arithmetic expressions and NULL values - Using SELECT statement and column aliases - Operator precedence rules - Limiting rows and substitution variables - Operators, literals, DISTINCT keyword |
| Topic 6: DDL for Tables and Relationships | 15% | - CREATE TABLE statement - Drop columns, set unused columns - Views management - Constraints management - TRUNCATE TABLE statement - Temporary and external tables - Table structure, columns, data types |
| Topic 7: Managing Tables with DML | 5% | - Transaction management and control - INSERT, UPDATE, DELETE operations - Multi-table INSERT and MERGE statements |
| Topic 8: Using Functions | 25% | - ROUND, TRUNC, MOD functions - Data type conversion: implicit and explicit - Date arithmetic and date functions - Nested functions - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - NVL, NULLIF, COALESCE functions - Group functions and grouping data - Character functions for string manipulation - Restricting group results |
| Topic 9: Using SET Operators | 5% | - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations |
| Topic 10: Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
| Topic 11: Relational Database Concepts | 5% | - Relationship between database and SQL - SQL SELECT clauses and ERD components - Relational database theoretical and physical aspects |
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問題 #90
How can you ensure that data is sorted in descending order in a SQL query?
答案：D
問題 #91
What is the purpose of the SAVEPOINT statement?
答案：D
問題 #92
What happens when the maximum value of a sequence is reached?
答案：B
問題 #93
Which type of join returns all rows from the left table, even if there are no matches in the right table?
答案：D
問題 #94
Which clause in an UPDATE statement typically uses a subquery to assign values to columns?
答案：B
問題 #95
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