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10 Questions

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11-20 câu SQL

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Questions and Answers

(0.150 Points) What is a stored procedure?

A set of SQL statements stored and executed as a single entity. (correct)

B. A process for data export/import.

C. Data stored in a database.

D. All of the above

(0.150 Point) Determine the error in the below SELECT statement SELECT ename, deptno, sal FROM emp WHERE job-CLERK;

A. WHERE clause cannot refer the column JOB since it doesn't appears in the SELECT column list

B. Character literal CLERK must be enclosed within single quotes (correct)

C. Character literal CLERK must be enclosed within parentheses

D. No error in the query

(0.150 Point) A table TEST_COUNT has 10 number values as 3, 32, 1, 1, null, 24, 12, null, 32, null. Predict the output of the below query. SELECT COUNT (*) FROM test_count;

A. 7

B. 6

C. 10 (correct)

D. Throws exception because COUNT function doesn't works with NULL values

(0.150 Point) Which SQL statement inserts data into a table called Projects?

B. INSERT INTO Projects (ProjectName, ProjectDescription) VALUES ('Content Development', 'Webske content development project') Signup and view all the answers

(0.150 Point) The LIKE SQL keyword is used along with...

B. WHERE clause. Signup and view all the answers

(0.150 Point) Why use a DBMS?

D. All of the above Signup and view all the answers

(0.150 Point) Which SQL statement selects all rows from table called Contest, with column ContestDate having values greater or equal to May 25, 2006?

B. SELECT FROM Contest WHERE ContestDate > 05/25/2006 Signup and view all the answers

(0.150 Point) Consider the following schema: SUPPLIERS(SupplierID, SupplierName, Address) Which SQL statement is used to REVOKE ALL privilege on the SUPPLIERS in the schema to the user 'Manager'?

A. REVOKE ALL ON SUPPLIERS FROM Manager Signup and view all the answers

19, (0.150 Point) What is an index?

A. An index is an internal table structure that SQL Server uses to provide quick access to rows of a table based on the values of one or more columns Signup and view all the answers

(0.150 Point) Which of the following is one of the basic types of joins in DB?

D. All of the above Signup and view all the answers

Study Notes

Stored Procedure

Pre-compiled set of SQL statements
Stored in the database
Can be executed by name

SQL Statement Error

job-CLERK should be job='CLERK'
Comparison operator = needs to be used
Quotes are needed to enclose the string value

Count in SQL

COUNT(*) function returns the number of rows in the table even if they contain null values
In this case, the output will be 10

SQL INSERT Statement

INSERT INTO statement is used to add new rows to the table

LIKE Keyword

The LIKE keyword is used with wildcard characters (%) or underscore (_) to match patterns in data

Using a Database Management System

To manage data effectively
To ensure data integrity
To control access to data
To improve performance and security

SQL SELECT Statement

SELECT * FROM Contest WHERE ContestDate >= '2006-05-25'
Date should be in the format YYYY-MM-DD

REVOKE Privilege

REVOKE ALL ON SUPPLIERS FROM Manager;
This will remove all privileges from the Manager user on the SUPPLIERS table

Database Index

An index is a data structure that helps to speed up data retrieval
It stores the values of one or more columns in a sorted order
Used to create efficient search conditions

Join Types

Inner Join
Left Join
Right Join
Full Join

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Description

This quiz explores what stored procedures are in the context of database management. Participants will learn their definition, purpose, and how they contribute to efficient database operations. Test your knowledge about stored procedures and their applications.