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| Section | Objectives |
|---|---|
| Topic 1: SQL Retrieval | - SELECT statements and filtering data
|
| Topic 2: SQL Functions | - Conversion and conditional functions
|
| Topic 3: Subqueries and Advanced SQL | - Correlated subqueries and nested queries - Single-row and multi-row subqueries |
| Topic 4: Data Manipulation and Schema Objects | - DML operations
|
| Topic 5: Relational Database Concepts | - Data types and database objects overview - Tables, rows, columns, and relational model basics |
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NEW QUESTION # 302
Examine this Statement which returns the name of each employee and their manager, SELECT e.last name AS emp,,m.last_name AS mgr FROM employees e JOIN managers m ON e.manager_ id = m. employee_ id ORDER BY emp; You want to extend the query to include employees with no manager. What must you add before JOIN to do this?
Answer: C
Explanation:
To include employees with no manager in the query results, a LEFT OUTER JOIN should be used. This type of join returns all records from the left table (employees), and the matched records from the right table (managers). The result is NULL from the right side if there is no match.
Here's the modified query:
SELECT e.last_name AS emp, m.last_name AS mgr FROM employees e LEFT OUTER JOIN managers m ON e.manager_id = m.employee_id ORDER BY emp; This ensures that even if an employee does not have a manager (i.e., e.manager_id is NULL or there is no corresponding m.employee_id), that employee will still be included in the results.
NEW QUESTION # 303
Examine the structure of the SHIPMENTS table:
You want to generate a report that displays the PO_ID and the penalty amount to be paid if the SHIPMENT_DATE is later than one month from the PO_DATE. The penalty is $20 per day.
Evaluate the following two queries:
Which statement is true regarding the above commands?
Answer: E
Explanation:
The MONTHS_BETWEEN(date 1, date 2) function returns the number of months between two dates:
months_between('01-FEB-2008','01-JAN-2008') = 1
The DECODE Function
Although its name sounds mysterious, this function is straightforward. The DECODE function implements if then-else conditional logic by testing its first two terms for equality and returns the third if they are equal and optionally returns another term if they are not. DECODE Function Facilitates conditional inquiries by doing the work of a CASE expression or an IF-THENELSE statement:
DECODE(col|expression, search1, result1
[, search2, result2,...,]
[, default])
DECODE Function
The DECODE function decodes an expression in a way similar to the IF-THEN-ELSE logic that is used in various languages. The DECODE function decodes expression after comparing it to each search value. If the expression is the same as search, result is returned.
If the default value is omitted, a null value is returned where a search value does not match any of the result values.
NEW QUESTION # 304
View the exhibit and examine the structures of the EMPLOYEESand DEPARTMENTStables.
You want to update EMPLOYEEStable as follows:
Update only those employees who work in Boston or Seattle (locations 2900 and 2700).
Set department_idfor these employees to the department_idcorresponding to London (location_id 2100).
Set the employees' salary in location_id2100 to 1.1 times the average salary of their department.
Set the employees' commission in location_id2100 to 1.5 times the average commission of their department.
You issue the following command:
What is outcome?
Answer: C
NEW QUESTION # 305
View the Exhibit and examine the description for the PRODUCTS and SALES table. is a primary key in the PRODUCTS table and foreign key in the SALES table with ON DELETE PROD_ID option. The SALES table contains data for the last three years. You want to remove all the rows CASCADE from the PRODUCTS table for which no sale was done for the last three years.
Which is the valid DELETE statement?
Answer: C
NEW QUESTION # 306
You execute the following commands:
For which substitution variables are you prompted for the input?
Answer: A
NEW QUESTION # 307
......
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