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INTRODUCTION TO SQL


1. The acronym SQL is derived from-(a)structured query language(b)SEQUEL(c)sequence query language(d)system query language


Sequel


2 . In Relational Database Management Systems, SQL supports

(a)Definition(b)Manipulation(c)control operations(d)All of the above


Ans: 4


3. Benefits of SQL are-(a)Retrieves data from a database(b)Inserts new records into a database(c)Deletes records from a database(d)Updates records in a database(e)All of the above


Ans: 5


4 .Depending on the functionality, SQL is classified as :

(a)Data Definition Language (DDL)(b)Data Manipulation Language (DML)(c)Data Control Language (DCL)(d)Transaction Control Language (TCL)(e)All of the above


4.(e)


5. Which of the following is not a DML SQL statement ?

a. INSERTb. UPDATEc. MERGEd. REVOKE


(5)d


6 .Which of the following option(s) best describe(s) SQL?

(a) Language used for managing only relational databases

(b) Language for converting database systems

(c)A DBMS(d)Standard language for operating

databases


Ans: d


7 .Which of the following are TCL SQL statements?

(a) INSERT(b) UPDATE(c) COMMIT(d) NONE OF THE ABOVE


Ans C


8. Which of the following are DDL SQL statements?

(a) CREATE(b) ALTER(c)DROP(d)ALL OF THE ABOVE


Ans d


9. Which of the following is DCL SQL statement?(a) INSERT(b) UPDATE(c) MERGE(d) REVOKE


Ans d


SQL CONTINUES


10.____________________ is/are a language used by DBMS which allows users to define the database and its objects.

(a)DML(b)DCL(c)DDL(d)TCL(e)both (a)and (b)


(c)DDL


11.DML is a language that enables users to _________________ data as organized by the appropriate data model.

(a)access and manipulate(b)access and update(c)access and define(d)None of the above


(a)access and manipulate


12.______________ is the most frequently used SQL commands.

(a)DML(b)DCL(c)DDL(d)TCL(e)I am not sure


(a) DML


13.__________________ is the segment of SQL used for controlling access to data in a database.

(a)DML(b)DCL(c)DDL(d)TCL(e)None of the above


(b)DCL


14.A language that allows protecting tables and other objects created by a user from accidental manipulation by another user-

(a)DML(b)DCL(c)DDL(d)TCL


(b)DCL


15.Odd one out(a)Insert(b)Read(c)Write(d)Revoke(depending upon DCL grant priviledges)


(d)Revoke


16.Which one is not a part of DML(a)Insert(b)Grant(c)Update(d)Merge


(b)Grant


DATA RETRIEVAL LANGUAGE


17. SELECT statement is used to ................. data from the table

1. Retrieve2. Update3. Delete4. None of these


Retrieve


18. Names of the columns separated by a .................. is used to retrieve multiple columns

1. *2. ,3. #4. &


,


19. ................. is used to retrieve all columns from the table

1. *2. #3. &4. ,


*


20. ............... is used with SELECT statement to retrieve all the dept names.

1. All2. Distinct3. 1 & 24. None of above


All


21. By-default all the values will be retrieved from the column though ALL is not specified

1. True2. False


True


22. ................... keyword is used with SELECT statement to retrieve unique values from a column

1. Distinct2. All3. Unique4. 1 & 3


Unique


23. ...................... selects from a list of values

1. In2. Between3. All4. Like


In


24. = , < , > , <= , >= , != or < > are ........................

Operators


Relational


.25. The LIKE operator allows you to use__________________ when searching a character field.

SQL Continued


Wildcard characters


26. A wildcard character matches only one characters in a string.

True or False


False


27. 2 types of wildcards are % and &.


False


28. To get EMPNO,ENAME, JOB of all employees working as SALESMAN or those employees whose

names start with A.

(i) SELECT EMPNO,ENAME,JOB FROM EMP WHERE JOB= 'SALESMAN‘ OR ENAME LIKE 'A%‘

(ii)SELECT EMPNO,ENAME, SAL, DEPTNO FROM EMP WHERE SAL >2000 AND DEPTNO=20

(iii) SELECT EMPNO,ENAME,JOB FROM EMP WHERE ENAME NOT LIKE 'A%‘(iv) SELECT EMPNO,ENAME, JOB,SALFROM EMP

WHERE ENAME LIKE ‘S%’;


(i) SELECT EMPNO,ENAME,JOB FROM EMP WHERE JOB= 'SALESMAN‘ OR ENAME LIKE 'A%‘


29. To get EMPNO, ENAME, JOB, SAL of all employees whose names do not start with A.

(i) SELECT EMPNO, ENAME,SAL FROM EMP WHERE COMM IS NULL;

(ii) SELECT EMPNO,ENAME,JOB FROM EMP WHERE JOB= 'SALESMAN‘ OR ENAME LIKE 'A%‘

(iii) SELECT EMPNO,ENAME,JOB FROM EMP WHERE ENAME NOT LIKE 'A%‘

(iv) SELECT EMPNO, ENAME,SAL FROM EMP WHERE COMM IS NOT NULL;


(iii) SELECT EMPNO,ENAME,JOB FROM EMP WHERE ENAME NOT LIKE 'A%‘


30.SELECT EMPNO,ENAME, JOB,SAL FROM EMP WHERE ENAME LIKE ‘S&’; where is the error


%


31. Arithmetic operations can be performed on a ___________a)single column

b) multiple columns c)either a or b

d)both a and b


either a or b


32.State true or false SELECT EMPNO,SAL+ COMM TOTALSAL

FROM EMP WHERE COMM IS NOT NULL;


true


33. what is alias?A. Aliases increases the readability of the

column name or a table name.B. An alias is another name for a collection

of data like a column or a table.C. Aliases are effective when we use

complicated joins or sub queries

1. all2.none


all


34.ORDER BY can be used either with a column name or with a column position.

True or false


true


35.What is job of nvl?1. Converts a null value to a non-null value.2. Converts a non-null value to a null value.3. both


A


36.SELECT DECODE(JOB,'ANALYST','A‘,'CLERK','C','MANAGER','M','PRESIDENT','P','SALESMAN','S')AS JOB FROM EMP: where is error?

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