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Oracle 1Z0-171 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Using Subqueries | - Use correlated subqueries - Use multiple-row subqueries - Use single-row subqueries |
| Topic 2: Using DDL Statements | - Create and manage sequences - Create and manage constraints - Create and manage views - Create and manage indexes - Create and manage tables |
| Topic 3: Using SELECT Statements | - Use the ORDER BY clause to sort rows - Execute a basic SELECT statement - Use the WHERE clause to restrict rows - Use the FETCH clause to limit rows returned |
| Topic 4: Using SQL Functions | - Use character, number, and date functions in SELECT statements - Use conversion functions |
| Topic 5: Using Joins | - Use self-joins - Use outer joins (LEFT, RIGHT, FULL) - Use equijoins and non-equijoins - Use cross joins |
| Topic 6: Using DML Statements | - Update rows in a table - Control transactions - Insert rows into a table - Delete rows from a table - Use the MERGE statement |
| Topic 7: Using Set Operators | - Use UNION, UNION ALL, INTERSECT, and MINUS operators |
| Topic 8: Controlling User Access | - Differentiate system privileges from object privileges - Create and manage roles - Grant and revoke privileges |
Oracle Database 23ai SQL Associate Sample Questions:
Question 1
What is the difference between UNION and UNION ALL?
A. UNION works with subqueries, while UNION ALL does not.
B. UNION includes all rows, while UNION ALL removes duplicates.
C. UNION removes duplicates, while UNION ALL includes all rows, including duplicates.
D. UNION combines columns, while UNION ALL combines rows.
Question 2
How can you ensure that data is sorted in descending order in a SQL query?
A. Use the DISTINCT keyword
B. Use the ORDER keyword
C. Use the ASC keyword
D. Use the DESC keyword
Question 3
What is the primary purpose of an index in SQL?
A. To improve the performance of data retrieval queries
B. To store metadata about a table
C. To enforce data integrity constraints
D. To ensure uniqueness of values in a column
Question 4
Which function returns the current system date and time in the database session's time zone?
A. LOCAL_TIME
B. SYSTEM_TIME
C. CURRENT_TIMESTAMP
D. SYSDATE
Question 5
What does the COMMIT statement do in SQL?
A. Discards all pending changes in the transaction
B. Begins a new transaction
C. Saves all pending changes to the database permanently
D. Rolls back changes to a previous state
Solutions:
| Question 1 Answer: C | Question 2 Answer: D | Question 3 Answer: A | Question 4 Answer: C | Question 5 Answer: C |
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