The WHERE or HAVING clause uses the ANY and ALL operators. INNER QUERY Fetches 5(because 30isless than 40, 50, 70, 80 and 90). The Teaches table stores the Course_id, Course_Name, andfaculty_id. In the specialization, the higher-level entity can be divided into sub lower entities. SQL MCQ (Multiple Choice Questions) Here we are going to see a list of important SQL questions in MCQ style with an explanation of the answer for competitive exams and interviews. Instead of creating a whole table or database again you can easily add single and multiple columns using the ADD keyword. After IPv4, the second major version of the internet protocol was IPv6, which was version 6. Mail us on [emailprotected], to get more information about given services. Therefore the correct answer is C. 52) Which one of the following keyword is used to find out the number of values in a column? For this, you have to type the following query in the SQL: Let's check using the following statement that the Car_Color column is deleted from the table or not: Suppose, you want to change the name of the. Index improves the speed of data retrieval operations on a table. Margin that is added to the left margin when printing, B. If M is the number of tuples returned by SQ1 and N is the number of tuples returned by SQ2 then M=______, N=______. The TCL commands are automatically committed in the database; that's why we cannot use them directly while creating tables or dropping them. In SQL, we can use the IS operator to compare a NULL. 51) A computer security protocol for logging-in can be considered as the example of the ______ component of an information system. The ALL give the result when all subquery values match the specified condition. SQL select from multiple tables with sql, tutorial, examples, insert, update, delete, select, join, database, table, join Without "having" clause query calculates the average age (where age >= 18) and groups by ratings so table returned is: After applying "having" clause table returned is: Consider a relational database containing the following schemes. SQL is regularly used not only by database administrators, but also by developers writing data integration scripts and data analysts looking to set up and run analytical queries. Herefaculty_id andfaculty_name are attributes. To save any transaction permanently into the database generally, the "commit" command is used, by which any changes get reflected permanently into the database, and they become irreversible. Source IP address: The source is the one who is sending the data. SQL's DELETE statement removes all data from the table but does not free the table's space. This statement must be used with ADD, DROP, and MODIFY clauses according to the situation. Explanation: A procedure is a prepared SQL code that can be saved in the system and reused whenever needed. Hence the option A is the correct choice. 38) What is the difference between a PRIMARY KEY and a UNIQUE KEY? Explanation: The term "SQL" stands for the structured query language, which is one of the most widely, used programming languages for relational databases. The top-down parsing initiates with the start symbol and ends on the terminals. Explanation: The files with a size of less than 4 GB or equal to 4GB are easily supported by the FAT. Table variable was introduced by Microsoft. The COUNT is a function in Structured Query Language that shows the number of records from the table in the result. All rights reserved. Pass in input parameters if it takes one and get the result. 1) Which of the following is generally used for performing tasks like creating the structure of the relations, deleting relation? COMPUTE is not an aggregate function. Create the table Product with appropriate data types and constraints. The primary key is a single or combination of the field that identifies each record in a table uniquely. Therefore the correct answer is the foreign key. MODIFY command is used to update the table attributeinformation. SELECT * FROM student WHERE name LIKE '%p%'; SELECT * FROM student WHERE name LIKE 'p%'; SELECT * FROM student WHERE name LIKE '_p%'; SELECT * FROM student WHERE name LIKE '%p'; It does not need extra work for SQL queries. Explanation: In the above-given Query, the "%" (like) operator will be used, which is generally used while searching for a certain pattern in the strings. It can be reused over and over again whenever we need to perform some common tasks. Inner Query: SELECT AVG (cost) FROM Cataloque WHERE pno = P4 GROUP BY pno, The execution of the inner query gives the average of the cost of parts with part-id P4, SELECT s.sno, s.sname FROM Suppliers s, Cataloque c WHERE s.sno = c.sno AND Cost > (225). These frequently asked SQL questions are given with the correct choice of answer among multiple options. The output of executing the SQL query is _________. 44) ______ is NOT a type of constraint in SQL language? But there are no players of spain. Which of the following represents the three basic SQL DML commands? The bottom-up approach is used in the generalization. Explanation: A CASE statement is one of the control flow function that allows us to write an if-else or if-then-else logic in a SQL query. The development of the protocol gets started in 1974 by Bob Kahn and Vint Cerf. Explanation: The DML statement is used to access and manipulate the data in an existing table. These are as follows: Internal Commands; External Commands; Internal Commands. It is used for defining a temporary relation whose definition is available by the query in which the WITH clause is associated. The "delete" command is one of the commands that belong to the Data manipulation language. Num) will find out the average of Num values in the returned query., \(Average = \;\frac{{4 + 3 + 3 + 2 + 1}}{5} = 2.6\), SAP Sybase, MySQL and Oracle are examples of. Explanation: This statement will give the result 0. 16) Which of the following statement is true? It is mostly used with the SELECT statement. Explanation: In SQL, the relation is represented by a table, and a table is a collection of rows and columns. A subquery is a query nested into another SQL query. 21) _______ clause creates temporary relation for the query on which it is defined. The SQL Table variable is used to create, modify, rename, copy and delete tables. Explanation: In a database, the number of rows inside a table is known as tuples, and if we further divide those tuples (or rows) into those fields, they become the domains. Is a DML command hence it can be rolled back, It does not rest the identity of the table, it just locks the table row. This statement deletes all the views and tables if stored in the database, so be careful while using this query in SQL. How many numbers of rows are possible in output of the below query? ; If you want to save all the commands which are executed in a transaction, then just after completing the transaction, you have to execute the commit command. Minimal super key is a candidate key Explanation: To delete an existing row in a table the generally, the "delete" command is used. Which can be used for quick access to commonly used commands and tools. Identify the primary key in Product. It is also known as the READ lock. The ALTER TABLE statement is used to add, delete, or modify columns in an existing table. The renaming is only a temporary change, and the actual table name in the database remains unchanged. The EQUAL operator is used to check whether the given expressions are equal or not. 46) Which of the following statement is correct to display all the cities with the condition, temperature, and humidity whose humidity is in the range of 60 to 75 from the 'whether' table? The BETWEEN operator selects values only in the given range. All rights reserved. The DDL Commands in Structured Query Language are used to create and modify the schema of the database and its objects. It also allows modifying the data stored in the database as well. Then the total number of rows in the resultant output will be 6. And each column is called fields and attributes. 28) In a relation database, every tuples divided into the fields are known as the______. We cannot find a primary key from the candidate key. Hence, we can say that the NOT NULL constraint can be defined only at the column level. ALTER TABLE Statement. SQL is a structured query language, which is used to deal with structured data. Mail us on [emailprotected], to get more information about given services. 50) Which of the following levels is considered as the level closed to the end-users? Destination IP address: The destination is a host that receives the data from the sender. SELECT city, temperature, condition FROM weather WHERE condition = 'cloudy' AND condition = 'sunny' OR temperature >= 60, SELECT city, temperature, condition FROM weather WHERE condition = 'cloudy' OR condition = 'sunny' OR temperature >= 60, SELECT city, temperature, condition FROM weather WHERE condition = 'sunny' OR condition = 'cloudy' AND temperature >= 60, SELECT city, temperature, condition FROM weather WHERE condition = 'sunny' AND condition = 'cloudy' AND temperature >= 60, SELECT * FROM weather WHERE humidity IN (60 to 75), SELECT * FROM weather WHERE humidity BETWEEN 60 AND 75, SELECT * FROM weather WHERE humidity NOT IN (60 AND 75), SELECT * FROM weather WHERE humidity NOT BETWEEN 60 AND 75. A word processor would most likely be used to do. Grant and Revokebelong to these types of commands of theData controlling Language. Explanation: The term "DBA" refers to the Database Administrator that manages the whole database and updates the database on a regular basis. It overcomes all the drawbacks, issues that exist in FAT file architecture and has many other new features such as it is fast, it can handle files whose size is even greater than 4 GB. Let's see the Syntax for the select top statement: JavaTpoint offers too many high quality services. 8) The given Query can be replaced with ____________: Explanation: The "SQL" contains a comparison known as the "BETWEEN," which is also used in one of the given queries, as you can see. Explanation: The SQL NOT NULL constraint prevents inserting NULL values into the specified column. Therefore the Operating system creates a table in which all the files and clusters are stored, known as the file allocation table. A table can have more than one unique key. RIGHT JOIN that shows only the unmatched rows from the right table. Margin that is added to the outside of the page when printing. Example of DDL commands: CREATE, DROP, ALTER etc. The AS clause in SQL is used to change the column name in the output or assign a name to a derived column. With the help of a public address, we can set up the home server to access the internet. SQL is used to perform all types of data operations Option B cannot be used to specify the column definitions because there are only INTERVAL DAY TO SECOND and INTERVAL YEAR TO MONTH data types. SELECT R1.RollNo. Please mail your requirement at [emailprotected] Duration: 1 week to 2 week. Through data mining, one can easily filter the useful information or data from the massive collection of the data. Select * from Table1; //Syntax is Select * from table_name; Consider the following database table named top_scorer. Please mail your requirement at [emailprotected] Duration: 1 week to 2 week. Allahabad University Group C Non-Teaching, Allahabad University Group A Non-Teaching, Allahabad University Group B Non-Teaching, BPSC Asst. It stores data in only one way based on the key values. Structure Query Language(SQL) is a database query language used for storing and managing data in Relational DBMS. SQL ALTER TABLE. Hence the correct answer isStructured Query Language. However, it does not explain how to retrieve the data. This address is used to access the internet. Explanation: To represent the relationships between the various tables in the database, generally, the foreign key is used. You can select your choice and check it instantly to see the answer with an explanation. III. Before an IP packet is sent over the network, two major components are added in an IP packet, i.e., header and a payload. FROM R, S In many situations, you may require to add the columns in the existing table. P: An SQL query can contain a HAVING clause even if it does not have a GROUP BY clause, Q: An SQL query can contain a HAVING clause only if it has a GROUP BY clause, R: All attributes used in the GROUP BY clause must appear in the SELECT clause, S: Not all attributes used in the GROUP BY clause need to appear in the SELECT clause, SELECTcolumn_name(s) Copyright 2011-2021 www.javatpoint.com. The database developers and the users use this statement in SQL for creating the new database in the database systems. Answer: (d) All of the these Explanation: A critical-section is a code segment that can be accessed by a signal mechanism at a given point of time. WHERE R.A=S.C AND S.D<7 Therefore the correct answer is D. In the above-given Query, which of the following can be placed in the Query's blank portion to select the "dept_name" that also contains Computer Science as its ending string? Explanation: In the database, the number of rows inside a table is called the tuples, and the numbers of columns are known as the attributes. Sometimes more than one attributes are needed to uniquely identify an entity. There are five types of SQL commands: DDL, DML, DCL, TCL, and DQL. Columns that make up the composite key can be of different data types. SQL Cross Join. The ALTER TABLE statement in Structured Query Language allows you to add, modify, and delete columns of an existing table. Explanation: SQL is a programming language used for managing data in a relational database management system. Explanation: In SQL statements, the WHERE clause always comes before GROUP BY, and the HAVING clause always comes after GROUP BY. The specified table must be in the same database or schema. Some of the most common query issues might be easily avoided if people had a better understanding of the SQL order of execution, often known as the SQL order of operations. 41) Which of the following statement is correct regarding the difference between TRUNCATE, DELETE and DROP command? It reduces the use of multiple OR conditions. 15) Which of the following can be used to extract or filter the data & information from the data warehouse? 12) The term "NTFS" refers to which one of the following? So the correct answer will be the B. Explanation: The UPDATE statement is used for modifying the table data by using the SET and WHERE clause. In which all the information about the files where they are stored and where all these files need to be stored or in which directory, all that information generally stored in the file structure. Explanation: Option D is the correct choice because it is the example of an inline view, which is the subquery in the FROM clause of the main query. This command will remove or flush all the entries from the table. 25) How can you change "Thomas" into "Michel" in the "LastName" column in the Users table? Explanation: In order to define the overall design of the database, generally, the schema is used. It can be classified into the following types: EQUI JOIN shows records for equality or matching column(s) values of the relative tables. This expression validates various conditions and shows the output when the first condition is true, and stops traversing. These frequently asked SQL questions are given with the correct choice of answer among multiple options. University name BITS has maintained the two relations to store the informationabout the faculty table and Teaches table. The address space for the private address is allocated using InterNIC to create our own network. Basically, aliases are created to increase the readability of the query and column headings in the output. Characteristic or parameters for which data are to be stored in a relation. 19) To which of the following the term "DBA" referred? 51) Which of the following are the DATETIME data types that can be used in column definitions? The faculty table stores the faculty_id (faculty_id has the unique id of faculty in the whole university) and faculty_name. The routing algorithm considers various factors like the size of the packet and its header to determine the efficient route for the data from the source to the destination. DROP is a DDL command that lost the data permanently, and it cannot be rolled back. OUTER JOIN is the only join that returned the unmatched rows in one or both tables. modifying columns etc. LEFT JOIN that shows only the unmatched rows from the left table. Distinct:Distinct in select (Eliminate the duplicates). Therefore option B is the correct choice. A table can contain multiple candidate keys, but it can have only a single primary key. It must be needed whenever we want to fetch records from two or more tables. SQL INSERT statement is a SQL query. Count the number of EmpIDs corresponding to a particular department and then write as attribute value of Num in new relational schema EC. SQL UPDATE. The TRUNCATE statement in SQL removes all data from the table and free the table's space. Explanation: The Mata Data refers to the type of data that describes the other data or information. It creates the database with the name which has been specified in the Create Database statement. In SQL, the 'Create Database' statement is a first step for storing the structured data in the database. The MODIFY keyword is used for changing the column definition of the existing table. GROUPBYcolumn_name(s), SELECT COMPANY, COUNT(*) Its maximum length is 32767 bytes. And the _ symbol is used to match exactly one character. The ability to combine name and addresses with a standard document is called ________. Options A and B are not data dictionary. Explanation: To removing( or deleting) a relation, the "drop" command is used instead of delete because here we are working on the objects of the database. Explanation: The DBMS (or Database Management System) is a kind of system software used for several operations such as creating tables/databases, storing data, managing databases. UPDATEtable_name This statement is similar to the DELETE statement without the WHERE clause. Simply stated, the columns of a relation are the attributes which are also referred as fields. S(B,C,D)={2,3,7,1,4,5,1,2,3,2,3,4,3,1,4 } A function MOD(1600, 10) returns 0 by calculating the modulus of 1600 when 1600 is divided by 10 until no further whole number can be produced. When the data packet reaches some router, then the source address and destination address are used with a routing table to determine the next hop's address. These internal commands may not be seen, modified, detected, or deleted because they do not exist in the form of a file. A database system provides a data-definition language (DDL) to specify the database schema. What result set is returned from the following SQL query? All are an example of DDL. Herefaculty_idisthe unique id of faculty in the whole university So it is theprimary keyin the faculty table. If you want to fetch only some specific columns from the table, then we can use this query. JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. Both TRUNCATE and DELETE statement does not free the table's space. The "BETWEEN" operator is generally used to simplify the "WHERE" clause that is used to specify that the value is greater than one value or greater than some values, less than one or more values. A trigger is also the set of SQL commands that reside in a system catalog, but it will be invoked automatically in response to an event. The EXISTS operator used in combination with a subquery, and if a subquery returns any record, this operator returns true. If you are not using GROUP BY clause then you can use HAVING function like a WHERE clause. Options A and C are correct. It is a special kind of stored procedure. Consider the following two SQL queries 9) A Database Management System is a type of _________software. 54) What is the need for our query to execute successfully on an existing view? To remove the table definition in addition to its data, use the DROP TABLE statement. It can be used with the SELECT, INSERT, UPDATE and DELETE statement. Copyright 2011-2021 www.javatpoint.com. Types of Parsing: There are two types of Parsing: The Top-down Parsing; The Bottom-up Parsing; Top-down Parsing: When the parser generates a parse with top-down expansion to the first trace, the left-most derivation of input is called top-down parsing. So, the correct answer will be tuples. The execution of the entire query output the following table: Hence, there are 4 rows in the resultant table. The main reason behind the development of IPv6 was to replace IPv4. CHAR stores character data in a fixed length. It is pronounced as See-Qwell. This data can be accessed in many different ways without reorganizing the database tables themselves. The FOREIGN KEY in SQL is used to join the record of two tables in the database. Explanation: The data redundancy generally occurs whenever more than one copy of the exact same data exists in several different places. Internal commands are loaded into the system memory during system booting. It cannot be created with SQL statements. The DML commands in Structured Query Language change the data present in the SQL database. Therefore the correct answer is C. 39) Which of the following refers collection of the information stored in a database at a specific time? SELF JOIN returns records from the tables by joining itself. The first version of IP (Internet Protocol) was IPv4. Developed by JavaTpoint. The statement produces the employee name, salary, department ID, and maximum salary earned in the employee department for all employees who earn less than the maximum salary in their department. Option 3 : The customer_name and telephone of all customers Living in either Jaipur Delhi or Agra. After the execution of DELETE and TRUNCATE operation retrieval is easily possible for the lost data, After the execution of DELETE operation, COMMIT and ROLLBACK statements can be performed to retrieve the lost data., while TRUNCATE do not allow it, After the execution of DELETE and TRUNCATE operation no retrieval is possible for the lost data. To understand it more clearly, consider the following example: JavaTpoint offers too many high quality services. Structured data is data that is generally stored in the form of relations or tables. Later, when the technology evolves with time, a new type of file system is introduced, known as the New Technology File System. Final result is tuples where name of district and total capacity should be more than or equal to 25. VALUES(value1,value2,value3, ); TRUNCATE TABLE removes all rows from a table, but the table structure and its columns, constraints, indexes, and so on remain. Key points related to public address are: A private address is also known as an internal address, as it is grouped under the LAN addresses. An instance of the schema EMP and a SQL query on it are given below. This statement also allows database users to add and remove various SQL constraints on the existing tables. So through the specialization, you can be divided further into sub-entities like two-wheelers and four-wheelers. Therefore, the Data Manipulation Language is used in the application programs while requesting the data from the database management system. Hence, the MODIFY command is used to change one or more fields in a record. List the Product Code, Product name and price in descending order of their product name. If a table with one or more candidate keys, then the keys other than the primary key is an alternate key. It returns a single value or sometimes does not produce any result. Syntax:The following is the basic syntax for a table alias.
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