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| Section | Weight | Objectives |
|---|---|---|
| Managing Tables and Constraints | - Constraints: primary key, foreign key, unique, check, not null - Temporary and external tables - Data types, creating/altering/dropping tables | |
| Managing Indexes, Synonyms and Sequences | - Create and use synonyms - Create and maintain indexes - Create and use sequences | |
| Controlling User Access | - Roles, granting and revoking privileges - System and object privileges | |
| Restricting and Sorting Data | 15% | - ORDER BY clause and sorting rules - WHERE clause and filtering conditions - Substitution variables, DEFINE and VERIFY commands - Operator precedence |
| Using SET Operators | - Ordering results with set operations - UNION, UNION ALL, INTERSECT, MINUS operators | |
| 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 |
| Relational Database Concepts | 10% | - Relationship between database and SQL - ERD and SQL statement mapping - Theoretical and physical aspects of relational databases |
| Using Data Dictionary Views | - Retrieve metadata and object information | |
| Manipulating Data and Managing Transactions | - Multi-table inserts - INSERT, UPDATE, DELETE, MERGE statements - Transaction control: COMMIT, ROLLBACK, SAVEPOINT | |
| Displaying Data from Multiple Tables | 15% | - Self-joins and outer joins - Cartesian products - Equijoins and non-equijoins |
| Managing Views | - Create, modify and drop views - Updatable and read-only views | |
| Using Single-Row Functions to Customize Output | 20% | - Character, number, and date functions - Nested functions usage |
| Using Subqueries to Solve Queries | - Single-row and multi-row subqueries - Correlated subqueries for update/delete | |
| Aggregating Data Using Group Functions | 10% | - GROUP BY and HAVING clauses - SUM, AVG, COUNT, MAX, MIN functions - Handling NULLs in group functions |
| Working with Time Zones and Date/Time Data | - TIMESTAMP, INTERVAL data types - Time zone conversion functions | |
| Retrieving Data Using SQL SELECT Statement | 20% | - Column aliases, concatenation, literals and DISTINCT - SELECT statement syntax and usage - Arithmetic operations and NULL handling |
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NEW QUESTION # 52
Examine the description of the sales table.
The sales table has 55,000 rows.
Examine this statements:
Which two statements are true?
Answer: C,D
Explanation:
Assuming the statement involves creating a new table SALES1 from the existing SALES table:
* B. SALES1 created with 55,000 rows: If the statement involved creating SALES1 by selecting all rows from SALES (such as with a CREATE TABLE AS SELECT operation), then all 55,000 rows would be copied if no WHERE clause limited the selection.
* E. SALES1 has NOT NULL constraints on any selected columns which had those constraints in the SALES table: When creating a table using the CREATE TABLE AS SELECT syntax, any NOT NULL constraints on columns in the original table will also apply to the new table.
Incorrect options:
* A: PRIMARY KEY and UNIQUE constraints are not automatically copied with a CREATE TABLE AS SELECT; they must be explicitly redefined.
* C: The table is created with rows if the original SELECT statement (assumed here) selected rows.
* D: The statement about creating a table with 1 row is incorrect based on the assumed full selection of the original table's rows.
NEW QUESTION # 53
The first DROP operation is performed on PRODUCTS table using the following command:
DROP TABLE products PURGE;
Then you performed the FLASHBACK operation by using the following command:
FLASHBACK TABLE products TO BEFORE DROP;
Which statement describes the outcome of the FLASHBACK command?
Answer: C
Explanation:
References:
https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_9003.htm
NEW QUESTION # 54
Examine the structure proposed for the TRANSACTIONS table:
Which two statements are true regarding the storage of data in the above table structure? (Choose two.)
Answer: B,D
NEW QUESTION # 55
Examine these two queries and their output:
SELECT deptno, dname FROM dept;
SELECT ename, job, deptno FROM emp ORDER BY deptno;
Now examine this query:
SELECT ename, dname
FROM emp CROSS JOIN dept WHERE job = 'MANAGER'
AND dept.deptno IN (10, 20) ;
Answer: D
Explanation:
In a CROSS JOIN (also known as a Cartesian join), each row from the first table (emp) is joined to every row of the second table (dept). When we apply the filter for job = 'MANAGER' and dept.deptno IN (10, 20), we are restricting the results to managers in departments 10 and 20.
From the given data:
* There are 2 managers in department 10 (CLARK and KING).
* There is 1 manager in department 20 (JONES).
With a cross join, each of these emp records will join with each dept record where deptno is 10 or 20. Since there are two departments (10 and 20) in the dept table, each employee will match with two departments.
Therefore, the result set will be:
* CLARK with accounting (dept 10) and research (dept 20)
* KING with accounting (dept 10) and research (dept 20)
* JONES with accounting (dept 10) and research (dept 20)
That gives us a total of 6 rows, which means the correct answer is B: 6.
NEW QUESTION # 56
The first DROP operation is performed on PRODUCTS table using this command:
DROP TABLE products PURGE;
Then a FLASHBACK operation is performed using this command:
FLASHBACK TABLE products TO BEFORE DROP;
Which is true about the result of the FLASHBACK command?
Answer: C
Explanation:
References:
https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_9003.htm
NEW QUESTION # 57
......
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