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| Section | Weight | Objectives |
|---|---|---|
| Manipulating Data | 14% | - Describe each data manipulation language (DML) statement - Insert rows into a table - Delete rows from a table - Update rows in a table - Control transactions |
| Working with Oracle Database SQL | 8% | - Explain the installation of Oracle Database software - Start up and shut down a database - Describe the Oracle Database architecture - Create a container database |
| Creating Other Schema Objects | 10% | - Create, maintain, and use sequences - Create synonyms for database objects - Create, modify, and retrieve data from a view - Create and maintain indexes |
| Using Set Operators | 5% | - Describe the order of precedence when the set operators are used - Use a set operator to combine multiple queries into a single query - Describe set operators |
| Controlling User Access | 5% | - Differentiate system privileges from object privileges - Distinguish between granting privileges and roles - Grant privileges on tables and on a view |
| Using Subqueries to Solve Queries | 15% | - Describe the types of problems that subqueries can solve - Write single-row and multi-row subqueries - Define subqueries - List the types of subqueries |
| Reporting Aggregated Data Using Group Functions | 15% | - Include or exclude grouped rows by using the HAVING clause - Describe the use of group functions - Group data by using the GROUP BY clause - Identify the available group functions |
| Restricting and Sorting Data | 6% | - Use ampersand substitution to restrict and sort output at runtime - Use DEFINE and UNDEFINE commands - Limit the rows that are retrieved by a query - Sort the rows that are retrieved by a query |
| Using Conversion Functions and Conditional Expressions | 10% | - Use conditional IF THEN ELSE logic in a SELECT statement - Apply the NVL, NULLIF, and COALESCE functions to data - Describe implicit and explicit data type conversion - Use the TO_CHAR, TO_NUMBER, and TO_DATE conversion functions |
| Using DDL Statements to Create and Manage Tables | 14% | - Review the table structure - Describe the data types that are available for columns - Drop, rename, and truncate tables - Alter table definitions - Create a simple table - Categorize the main database objects |
| Displaying Data from Multiple Tables Using Joins | 15% | - View data that does not meet a join condition by using outer joins - Join a table to itself by using a self-join - Write SELECT statements to access data from more than one table using equijoins and non-equijoins - Cross join tables |
| Retrieving Data Using the SQL SELECT Statement | 5% | - Differentiate between SQL statements and SQL*Plus commands - Execute a basic SELECT statement - List the capabilities of SQL SELECT statements |
| Using Single-Row Functions to Customize Output | 10% | - Manipulate strings with character function in the SELECT and WHERE clauses - Describe the differences between single-row and multiple-row functions - Manipulate dates with the date functions - Manipulate numbers with the ROUND, TRUNC, and MOD functions - Perform arithmetic with date data |
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NEW QUESTION # 57
Examine the command:
What does ON DELETE CASCADE Imply?
Answer: D
NEW QUESTION # 58
Examine this query:
SELECT 2 FROM dual d1 CROSS JOIN dual d2 CROSS JOIN dual d3;
What is returned upon execution?
Answer: B
Explanation:
The given query is using the CROSS JOIN clause, which produces a Cartesian product of the tables involved.
The DUAL table in Oracle is a special one-row, one-column table present by default in all Oracle database installations. When you cross join the DUAL table with itself multiple times without any where clause to limit the rows, the result is a multiplication of the row count for each cross-joined instance.
Since DUAL has a single row, cross-joining it with itself any number of times will still result in a single row being returned. The SELECT 2 part of the query simply dictates that the number 2 will be the value in the column of this single row.
So, the result of this query will be one row with a single column containing the value 2.
References:
* Oracle Database SQL Language Reference 12c, especially sections on join operations and the DUAL table.
NEW QUESTION # 59
Which statements are true? (Choose all that apply.)
Answer: C,D,F
Explanation:
References:
https://docs.oracle.com/cd/B10501_01/server.920/a96524/c05dicti.htm
NEW QUESTION # 60
You executed the following CREATE TABLE statement that resulted in an error:
SQL> CREATE TABLE employees(emp_id NUMBER(10) PRIMARY KEY, ename VARCHAR2(20), email NUMBER(3) UNIQUE, address VARCHAR2(500), phone VARCHAR2(20), resume LONG, hire_date DATE, remarks LONG, dept_id NUMBER(3) CONSTRAINT emp_dept_id_fk REFERENCES departments (dept_id), CONSTRAINT ename_nn NOY NULL(ename));
Identify two reasons for the error.
Answer: A,C
NEW QUESTION # 61
Which two statements are true about substitution variables? (Choose two.)
Answer: C,D
NEW QUESTION # 62
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