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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Working with Time Zones and Date/Time Data | - TIMESTAMP, INTERVAL data types - Time zone conversion functions | |
| Topic 2: Conversion Functions and Conditional Expressions | 10% | - TO_CHAR, TO_NUMBER, TO_DATE functions - NVL, NULLIF, COALESCE and CASE expressions - Implicit and explicit data type conversion |
| Topic 3: Using SET Operators | - UNION, UNION ALL, INTERSECT, MINUS operators - Ordering results with set operations | |
| Topic 4: Relational Database Concepts | 10% | - Relationship between database and SQL - Theoretical and physical aspects of relational databases - ERD and SQL statement mapping |
| Topic 5: Manipulating Data and Managing Transactions | - Transaction control: COMMIT, ROLLBACK, SAVEPOINT - INSERT, UPDATE, DELETE, MERGE statements - Multi-table inserts | |
| Topic 6: Using Subqueries to Solve Queries | - Single-row and multi-row subqueries - Correlated subqueries for update/delete | |
| Topic 7: Managing Indexes, Synonyms and Sequences | - Create and maintain indexes - Create and use sequences - Create and use synonyms | |
| Topic 8: Restricting and Sorting Data | 15% | - WHERE clause and filtering conditions - Substitution variables, DEFINE and VERIFY commands - Operator precedence - ORDER BY clause and sorting rules |
| Topic 9: Managing Tables and Constraints | - Temporary and external tables - Data types, creating/altering/dropping tables - Constraints: primary key, foreign key, unique, check, not null | |
| Topic 10: Using Data Dictionary Views | - Retrieve metadata and object information | |
| Topic 11: Displaying Data from Multiple Tables | 15% | - Cartesian products - Self-joins and outer joins - Equijoins and non-equijoins |
| Topic 12: Managing Views | - Updatable and read-only views - Create, modify and drop views | |
| Topic 13: Controlling User Access | - System and object privileges - Roles, granting and revoking privileges | |
| Topic 14: Retrieving Data Using SQL SELECT Statement | 20% | - Arithmetic operations and NULL handling - Column aliases, concatenation, literals and DISTINCT - SELECT statement syntax and usage |
| Topic 15: Aggregating Data Using Group Functions | 10% | - Handling NULLs in group functions - GROUP BY and HAVING clauses - SUM, AVG, COUNT, MAX, MIN functions |
| Topic 16: Using Single-Row Functions to Customize Output | 20% | - Character, number, and date functions - Nested functions usage |
>> Valid Oracle 1z1-071 Exam Topics <<
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NEW QUESTION # 243
Which is true about the & and && prefixes with substitution variables?
Answer: B,C
NEW QUESTION # 244
Which three statements are true about inner and outer joins?
Answer: C,F
Explanation:
A: True. A full outer join does indeed return both matched and unmatched rows from both tables involved in the join. It combines the results of both left and right outer joins.
E: True. An inner join, by definition, returns rows that have matching values in both tables. Rows from both tables that do not match are not returned in an inner join result set.
Inner joins match rows from the joined tables based on the join condition, while outer joins include all rows from one or both tables regardless of whether a matching row exists in the other table.
Reference:
The Oracle SQL documentation explains different types of joins, including inner joins, left and right outer joins, and full outer joins, clarifying how they differ in the result sets they produce.
NEW QUESTION # 245
Examine the description of the EMPLOYEES table:
Which query is valid?
Answer: D
Explanation:
When using the GROUP BY clause, every column in the SELECT clause that is not an aggregate function must be included in the GROUP BY clause:
A . SELECT dept_id, join_date, SUM(salary) FROM employees GROUP BY dept_id, join_date: This is a valid query because all non-aggregate columns in the SELECT list (dept_id and join_date) are included in the GROUP BY clause.
Queries B and C are invalid because they attempt to nest aggregate functions, which is not allowed. Query D is invalid because join_date is not included in the GROUP BY clause.
Reference:
Oracle Database SQL Language Reference 12c, specifically the section on GROUP BY clause constraints.
NEW QUESTION # 246
Which three statements are true about Structured Query Language (SQL)? (Choose three.)
Answer: A,B,D
Explanation:
Explanation/Reference: https://docs.microsoft.com/en-us/sql/relational-databases/hierarchical-data-sql-server?view=sql- server-2017
NEW QUESTION # 247
Evaluate the following SQL statement:
SELECT product_name || 'it's not available for order'
FROM product_information
WHERE product_status = 'obsolete';
You received the following error while executing the above query:
ERROR
ORA-01756: quoted string not properly terminated
What would you do to execute the query successfully?
Answer: B
Explanation:
Explanation/Reference:
References:
http://docs.oracle.com/cd/B19306_01/server.102/b14200/sql_elements003.htm
NEW QUESTION # 248
......
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