d) CREATE VIEW AS UPDATE DBMS MCQ with detailed explanation for interview, ... D SQL . For example, supposing you try to create a view with ordering, but no TOPkeyword: If you run this SQL, you get the following error: The solution is to add TOP 100 PERCENT to your view, but even this doesn't guarantee that the rows are returned sorted. Let’s talk about these in detail. A Data security . Data protection – create views to protect sensitive data. Question No : 156 An advantage of views is . To save users from having to write an expression. The sample view, vWEmployeesByDepartment, hides the complexity of joins. A view is nothing more than a saved SQL query. Explanation: A view is also known as a virtual table because it contains rows and columns similar to a real table. Advantages of Indexed Views in SQL Server. Views provide an abstraction layer to underlying data, simplifying data access. (B) Error Handling. d) sys.dm_exec_connections Now, let’s see what are the advantages of using the Views in SQL. b) DELETE VIEW Row Level Security:For example, I want an end user, to have access only to IT Department employees. a) DROP VIEW b) Index Created on View Used Often Just as a function (in programming) can provide abstraction, so can a database view. Correct Answer : C. Share this question with your friends. All Rights Reserved. Joins. d. None of the above is correct - computations cannot be placed in a view. Integrity Constraints. Advantages. View Answer Discuss. d) None of the Mentioned UPDATE: - The UPDATE Statement is used to modify the existing rows in a table. B Derived columns . d) These are used to show database self describing information In addition to the security feature pointed out earlier: If you're writing a large number of queries that would perform that join, it factors out that SQL code. These SQL join and view mcq are asked in Software jobs written interviews. Views can be used to reduce the complexity of the database schema, for non IT users. c) Catalog View If I grant him access to the underlying tblEmployees and tblDepartments tables, he will be able to see, every department employees. PL/SQL Server Pages (PSPs) enable you to develop Web pages with dynamic content. However, we can change this default behaviour, which we will talk about in a later session. DML operations on a view like INSERT, UPDATE, DELETE affects the data in the original table upon which the view is based. For example the salary column was hidden in my example above. c) DROP VIEW AS SELECT SQL manages to create a view by giving the view a name as a table name and stores the definition of the database's view. Security; Query re-usability; Abstraction – hiding data; All; View Answer © 2011-2021 Sanfoundry. Which of the following is not a SQL Server INFORMATION_SCHEMA view? The Advantage of PL/SQL is - PL/SQL subprograms, unlike anonymous blocks, are compiled each time they are executed. When this query is executed, the database engine actually retrieves the data from the underlying base tables, tblEmployees and tblDepartments. RENAME, REVOKE and GRANT are DDL (Data Definition Language) commands and UPDATE is DML (Data Manipulation Language) command. SQL Basics. So, this is the reason, a view is considered, as just, a stored query or a virtual table. View Answer, 5. The sample view, vWEmployeesByDepartment, hides the complexity of joins. Below are few SQL Server MCQ test that checks your basic knowledge of SQL Server.This SQL Server Test contains around 20 questions of multiple choice with 4 options.You have to select the right answer to a question. Data Manipulation Language. Views can be used to present only aggregated data and hide detailed data. A view is stored as a SELECT statement in the database. Advantages 1) We can use the views for hiding the complexity of the data. A view is actually a composition of a table in the form of a predefined SQL query. Structural simplicity. Consistency: Y ou can hide the complex queries logic and calculations in views. To a database user, a view appears like a real table, with a set of data rows and columns. Oracle question bank and quiz comprising samples, examples, code and theory based questions from … I will explain this with an example:- You run a small shop where you sell stationery items. Limitations and Dis-Advantages of Views in SQL Server We cannot pass parameters to SQL Server views Cannot use Order By clause with views without specifying FOR XML, OFFSET or TOP The Views cannot be created based on Temporary Tables in SQL Server By Dusan Petkovic on September 11, 2013 . Views, which are a type of virtual tables allow users to do the following − Data Definition Language. B. You can see the correct answer by clicking view answer link. In Oracle SQL no insert, update, or delete modifications on views are allowed that use one of the following constructs in the view definition: A. For example, the following query creates a sorted view then returns al… Take SQL Server Quiz To test your Knowledge . Non-IT users, finds it easy to query the view, rather than writing complex joins.2. Advantages and Disadvantages of views in Sql Server Advantages of views. a. The Syntax to create a sql view is: CREATE VIEW view_name AS SELECT column_list FROM table_name [WHERE condition]; view_name is the name of the VIEW. d) four c) Cross Database Queries Not Allowed in Indexed View SQL View An SQL View is a specific representation of data from one or more tables. A view can also be considered as a virtual table. The "BETWEEN" operator is generally used to simplify the "WHERE" clause that is used to specify that the value is greater than one … Advantages of using views: 1. View Answer, 8. d) All of the Mentioned Dynamic Management View is a type of ___________ b) Views are virtual tables that are compiled at run time Which of the following is not a limitation of view? In this article, I am going to discuss the Advantages and Disadvantages of Indexes in SQL Server with examples. Simplicity: It is many relations and tables. (C) Portability. c) REMOVE VIEW A directory of Objective Type Questions covering all the Computer Science subjects. 3. c) A view is a database diagram Here are the advantages and disadvantages of the creating views in the Transact-SQL. View Answer, 3. Oracle Views, Sequences & Synonyms objective type questions with answers and explanation (MCQs) for interview and placement tests. Column Level Security:Salary is confidential information and I want to prevent access to that column. Here you can access and discuss Multiple choice questions and answers for various compitative exams and interviews. b) User Defined View D All of the above . Even if you put an ORDER BY clause in a view, it won't order the data correctly unless you also specify how many rows you want to display. In general, the advantage of indexed views is that this makes queries run faster, because SQL Server can take advantage of the indexed view even if the view is not referenced in the query. Which of the following is not advantage of PL/SQL. Views can be used to reduce the complexity of the database schema, for non IT users. Ans : A. a) one The View itself, doesnot store any data by default. 1. A View can either have all the rows of a table or specific rows based on certain condition. Advantages and disadvantages of views in SQL Server . MCQ – Multiple choice questions on SQL join and SQL view with answers and explanation. Views are used for security purposes. C Hiding of complex queries . To ensure that the results are consistent. We will base all our examples on tblEmployee and tblDepartment tables. Now, let's write a Query which returns the output as shown below: To get the expected output, we need to join tblEmployees table with tblDepartments table. The tables referred in the views are known as Base tables. When you create indexes on views, SQL Server automatically updates the data of the index. b) INFORMATION_SCHEMA.DOMAIN_CONSTRAINTS A view is not stored separately: when you query a view, the view is replaced with the definition of that view. Explanation: The "SQL" contains a comparison known as the "BETWEEN," which is also used in one of the given queries, as you can see. Product name - Pen 3. Structured Query Language Multiple Choice Questions and Answers or Database Management System MCQs from chapter SQL. c) These types of view are defined by users on a specified schema View Answer, 6. a) CREATE VIEW AS SELECT Views are used to only display the required data to the users by keeping sensitive data safe. d) None of the mentioned a) Database-scoped Dynamic Management View b) Complex View View Answer, 4. SQL MCQ Topics. You can delete a view with ___________ command. These solved Objective questions with answers for online exam preparations section include various commands. Entity Relationship Model. c) three Explanation: Views are a valuable tool for the SQL Server Developer because they hide complexity and allow for a readable style of SQL expression. Left Join Left Outer Join Right Outer Join Cross Join Q) Which SQL Join is used … Read more MCQs – SQL Join and SQL View b) two What is SCHEMABINDING a VIEW? However there are certain limitations for SQL Server views. (D) Security. Let's understand advantages of views with an example. Q) The SQL join which does Cartesian product is called? Participate in the Sanfoundry Certification contest to get free Certificate of Merit. What is an advantage of placing computations in SQL views? You have a system where you feed below details about an item in one table PRODUCTS:- 1. a) A view is a special stored procedure executed when certain event occurs D. MCQ No - 3. This set of SQL Server Multiple Choice Questions & Answers (MCQs) focuses on “Views”. Views can be used as a mechanism to implement row and column level security. View Answer, 7. b) These are stored only in the Master database b) CREATE VIEW AS UPDATE Which of the following statement is true? Discussion. a) INFORMATION_SCHEMA.CONSTRAINT_TABLE_USAGE View Answer. View Answer Discuss. Sometimes you get a warning about this problem. What is a view? Below are the advantages of using views: If we need to maintain any sensitive information by providing limited access to the users, views are used for that purpose. View Answer, 2. ___________ is stored only in the Master database. Code re-use – simplifies application development. Syntax for creating views is __________ a) Views could be looked as an additional layer on the table which enables us to protect intricate or sensitive data based upon our needs Join our social networks below and stay updated with latest contests, videos, internships and jobs! PL/SQL stands for - which of the following datatypes supports PS/SQL ? b) A view is a virtual table which results of executing a pre-compiled query If some business logic changes for presenting data, change it once in the view and not many times in different places. The main advantages of stored procedure are given below: Better Performance – The procedure calls are quick and efficient as stored procedures are compiled once and stored in executable form.Hence the response is quick. A view can be created from one or many tables which depends on the written SQL query to create a view. Q) Advantages of View are. Security: You can restrict the users to access a table directly and allow them to access a subset of data via views. To achieve this, we can create a view, which excludes the Salary column, and then grant the end user access to this views, rather than the base tables. Explanation: All of the above operation (s) can perform on SQL Views. Depending on the SQL engine used, views can provide extra security. d) TRUNCATE VIEW At this point Employees and Departments table should look like this. It shows the table interface but cannot be stored in a database. what is the purpose of triggers ? To practice all areas of SQL Server, here is complete set of 1000+ Multiple Choice Questions and Answers. Views are used for the various purposes. 20. A view also has rows and columns as they are in a real table in the database. b. 1. a) ORDER BY Does Not Work Product id - 12345 (for item 1) 2. So and changes to the data in the tables will show up immediately via the view. which of the following are the features of PL/SQL. Aggregate function such as sum, min, max etc. here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - SQL Server Questions and Answers – Joins, Next - SQL Server Questions and Answers – Aggregation of Data, SQL Server Questions and Answers – Aggregation of Data, Bachelor of Computer Applications Questions and Answers, SAN – Storage Area Networks Questions & Answers, C Programming Examples on Data-Structures, Java Programming Examples on Data-Structures, Java Programming Examples on Utility Classes, Master of Computer Applications Questions and Answers, Database Management System Questions and Answers. Advantages and Disadvantages of Indexes in SQL Server. Views in SQL are kind of virtual tables. c) Simple View The maximum number of columns that can be defined in a SQL View are 1000 as in tables. In another parallel with functions, database users can manipulate nested views, thus one view can aggregate data from other views. This online test is useful for beginners, freshers, experienced candidates, dba, developers preparing for job interview, university exams, certification etc. Please read our previous article where we discussed Index in Group By Clause in SQL Server. We can create a view by selecting fields from one or more tables present in the database. View Answer, 10. To achieve this, I can create a view, which returns only IT Department employees, and grant the user access to the view and not to the underlying table. Practice these MCQ questions and answers for preparation of various competitive and entrance exams. Cascading referential integrity constraint. View Answer, 9. Sanfoundry Global Education & Learning Series – SQL Server. c. To accomplish both of the above. Views in SQL Server are nothing more than saved SQL queries. c) INFORMATION_SCHEMA.KEY_COLUMN_USAGE GRANT: - In SQL GRANT is a command used to provide access or privileges on the database objects to the users. Advantages of Database Views. Explanation: Materialized views help to keep the database up-to-date. a) System Defined Views a) Schema binding binds your views to the dependent physical columns of the accessed tables specified in the contents of the view c) Creating views can improve query response time A view can contain all rows of a table or select rows from a table. SQL Server has mainly how many types of views? Creating a view does not take any storage space as only the query is stored in the data dictionary and the actual data is not stored anywhere. (A) Support to variables. d) Adding Column is Expensive by Joining Table Outside View d) Complex View

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