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| Section | Weight | Objectives |
|---|---|---|
| Using SET Operators | 5% | - Matching SELECT statements - UNION, UNION ALL, INTERSECT, MINUS operators - Using ORDER BY with set operations |
| Managing Indexes, Synonyms, Sequences | 5% | - Create and manage synonyms - Create and manage sequences - Create and manage indexes |
| Data Dictionary and Time Zones | 5% | - CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIMESTAMP - INTERVAL data types - Using data dictionary views |
| DDL for Tables and Relationships | 15% | - TRUNCATE TABLE statement - Constraints management - Views management - Temporary and external tables - Table structure, columns, data types - CREATE TABLE statement - Drop columns, set unused columns |
| Using Subqueries | 5% | - Correlated subqueries for update and delete - Single-row and multi-row subqueries |
| Relational Database Concepts | 5% | - Relational database theoretical and physical aspects - Relationship between database and SQL - SQL SELECT clauses and ERD components |
| Controlling User Access | 5% | - Roles creation and privilege assignment - System vs object privileges - Granting privileges on tables |
| Managing Tables with DML | 5% | - Multi-table INSERT and MERGE statements - Transaction management and control - INSERT, UPDATE, DELETE operations |
| Retrieving and Sorting Data | 15% | - Operators, literals, DISTINCT keyword - Operator precedence rules - Sorting query results - Using SELECT statement and column aliases - Arithmetic expressions and NULL values - DEFINE and VERIFY commands - Limiting rows and substitution variables |
| Using Functions | 25% | - NVL, NULLIF, COALESCE functions - Group functions and grouping data - ROUND, TRUNC, MOD functions - Data type conversion: implicit and explicit - TO_CHAR, TO_NUMBER, TO_DATE conversion functions - Nested functions - Restricting group results - Date arithmetic and date functions - Character functions for string manipulation |
| Displaying Data from Multiple Tables | 10% | - Different types of joins: equijoin, non-equijoin, outer join, self-join - Cartesian products |
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問題 #97
Which type of subquery returns exactly one value?
答案：A
問題 #98
Which function returns the current system date and time in the database session's time zone?
答案：D
問題 #99
Which SQL clause can be used in Oracle to limit the number of rows returned?
答案：B
問題 #100
Which data dictionary view lists all indexes created by the current user?
答案：B
問題 #101
How can you ensure that data is sorted in descending order in a SQL query?
答案：B
問題 #102
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