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| Section | Weight | Objectives |
|---|---|---|
| Creating Other Schema Objects | 10% | - Create, modify, and retrieve data from a view - Create and maintain indexes - Create synonyms for database objects - Create, maintain, and use sequences |
| Using Conversion Functions and Conditional Expressions | 10% | - Use conditional IF THEN ELSE logic in a SELECT statement - Describe implicit and explicit data type conversion - Apply the NVL, NULLIF, and COALESCE functions to data - Use the TO_CHAR, TO_NUMBER, and TO_DATE conversion functions |
| Working with Oracle Database SQL | 8% | - Start up and shut down a database - Create a container database - Explain the installation of Oracle Database software - Describe the Oracle Database architecture |
| Displaying Data from Multiple Tables Using Joins | 15% | - Write SELECT statements to access data from more than one table using equijoins and non-equijoins - Join a table to itself by using a self-join - View data that does not meet a join condition by using outer joins - Cross join tables |
| Using Single-Row Functions to Customize Output | 10% | - Describe the differences between single-row and multiple-row functions - Manipulate strings with character function in the SELECT and WHERE clauses - Perform arithmetic with date data - Manipulate dates with the date functions - Manipulate numbers with the ROUND, TRUNC, and MOD functions |
| Using Subqueries to Solve Queries | 15% | - List the types of subqueries - Describe the types of problems that subqueries can solve - Define subqueries - Write single-row and multi-row subqueries |
| Restricting and Sorting Data | 6% | - Sort the rows that are retrieved by a query - Limit the rows that are retrieved by a query - Use ampersand substitution to restrict and sort output at runtime - Use DEFINE and UNDEFINE commands |
| 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 |
| Using DDL Statements to Create and Manage Tables | 14% | - Categorize the main database objects - Describe the data types that are available for columns - Drop, rename, and truncate tables - Create a simple table - Review the table structure - Alter table definitions |
| Manipulating Data | 14% | - Update rows in a table - Delete rows from a table - Insert rows into a table - Control transactions - Describe each data manipulation language (DML) statement |
| 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 |
| Reporting Aggregated Data Using Group Functions | 15% | - Identify the available group functions - Group data by using the GROUP BY clause - Include or exclude grouped rows by using the HAVING clause - Describe the use of group functions |
| Controlling User Access | 5% | - Grant privileges on tables and on a view - Differentiate system privileges from object privileges - Distinguish between granting privileges and roles |
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NEW QUESTION # 180
Sales data of a company is stored in two tables, SALES1and SALES2, with some data being duplicated across the tables. You want to display the results from the SALES1table, which are not present in the SALES2table.
Which set operator generates the required output?
Answer: B
Explanation:
Explanation/Reference:
References:
https://docs.oracle.com/cd/B19306_01/server.102/b14200/queries004.htm
NEW QUESTION # 181
Which statement is true regarding the USINGclause in table joins? (Choose two.)
Answer: C,D
NEW QUESTION # 182
The SYSDATEfunction displays the current Oracle Server date as:
21-MAY-19
You wish to display the date as:
MONDAY, 21 MAY, 2019
Which statement will do this?
SELECT TO_DATE(SYSDATE, 'FMDAY, DD MONTH, YYYY') FROM DUAL;
Answer: D
Explanation:
SELECT ID, TO_CHAR(Start_Date,'fmDay Month fmDD, YYYY') AS "Start Date" FROM Employee; Reference: http://www.java2s.com/Code/Oracle/Data-Type/ TOCHARDatefmDayMonthfmDDYYYYEmbeddedspacescanberemovedbyplacingthefmprefix.htm
NEW QUESTION # 183
which three statements are true regarding single row subqueries?
Answer: A,E,F
Explanation:
Regarding single-row subqueries:
A . THEY CAN BE USED in the where clause: Single-row subqueries can be used in the WHERE clause to compare a column's value against the result of the subquery.
B . A SQL STATEMENT MAY HAVE MULTIPLE SINGLE ROW SUBQUERY BLOCKS: It is possible to use more than one single-row subquery within a SQL statement, each potentially in different parts of the statement (e.g., SELECT clause, WHERE clause).
E . THEY CAN BE USED IN THE HAVING CLAUSE: Similar to the WHERE clause, single-row subqueries can also be used in the HAVING clause to filter groups based on a condition evaluated against a subquery result.
Incorrect options are:
C and D: There is no such limitation on the placement of single-row subqueries relative to the comparison operator; they can be used on either side.
F: Single-row subqueries must return exactly one row to avoid errors, but they do not necessarily have to return a row; if no row is returned, the query may still execute, potentially returning no rows in the outer query.
NEW QUESTION # 184
Examine the description of the EMPLOYEES table:
NLS_DATE FORMAT is DD-MON-RR.
Which two queries will execute successfully?
Answer: A
Explanation:
In Oracle SQL, aggregation functions such as AVG and MAX cannot be nested directly inside each other and must be used in conjunction with GROUP BY on the column(s) that are not included in the aggregate function.
Also, the HAVING clause filters groups after aggregation is applied.
A). This query will not execute successfully because it improperly nests MAX inside AVG. Oracle SQL does not allow this type of nested aggregation without a subquery.
B). This query will not execute successfully for the same reason as A, it improperly nests MAX inside AVG.
C). Similar to A and B, this query improperly nests SUM inside MAX, which is not allowed without a subquery.
D). This query will execute successfully. It filters rows based on the HIRE_DATE using a correct date format (assuming '9' refers to '09' or '1999' due to the NLS_DATE_FORMAT being 'DD-MON-RR'), then groups the remaining rows by DEPT_ID and calculates the sum of SALARY for each department.
E). This query will not execute successfully because it improperly nests MAX inside AVG without a subquery, and it incorrectly attempts to GROUP BY SALARY, which is already being aggregated.
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "Aggregate Functions"
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "GROUP BY Clause"
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "HAVING Clause"
NEW QUESTION # 185
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