McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) , Bachelor of Science in Computer Science FY (BSc CS) , Bachelor of Science in Computer Science SY (BSc CS) , Bachelor of Science in Information Technology SY (BSc IT) , Bachelor of Computer Applications (BCA) .
Chapters
| 201. |
How can you find rows that do not match some specified condition? |
| A. | exists |
| B. | double use of not exists |
| C. | not exists |
| D. | none of the mentioned |
| Answer» B. double use of not exists | |
| 202. |
Which one of the following deletes all the entries but keeps the structure of the relation. |
| A. | delete from r where p; |
| B. | delete from instructor where dept name= ’finance’; |
| C. | delete from instructor where salary between 13000 and 15000; |
| D. | delete from instructor; |
| Answer» D. delete from instructor; | |
| 203. |
The problem of ordering the update in multiple updates is avoided using |
| A. | set |
| B. | where |
| C. | case |
| D. | when |
| Answer» C. case | |
| 204. |
The condition allows a general predicate over the relations being joined. |
| A. | on |
| B. | using |
| C. | set |
| D. | where |
| Answer» A. on | |
| 205. |
Which of the join operations do not preserve non matched tuples? |
| A. | left outer join |
| B. | right outer join |
| C. | inner join |
| D. | natural join |
| Answer» C. inner join | |
| 206. |
What type of join is needed when you wish to include rows that do not have matching values? |
| A. | equi-join |
| B. | natural join |
| C. | outer join |
| D. | all of the mentioned |
| Answer» C. outer join | |
| 207. |
How many tables may be included with a join? |
| A. | one |
| B. | two |
| C. | three |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 208. |
Which are the join types in join condition: |
| A. | cross join |
| B. | natural join |
| C. | join with using clause |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 209. |
How many join types in join condition: |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 210. |
The operation which is not considered a basic operation of relational algebra is |
| A. | join |
| B. | selection |
| C. | union |
| D. | cross product |
| Answer» A. join | |
| 211. |
In SQL the statement select * from R, S is equivalent to |
| A. | select * from r natural join s |
| B. | select * from r cross join s |
| C. | select * from r union join s |
| D. | select * from r inner join s |
| Answer» B. select * from r cross join s | |
| 212. |
Which of the following creates a virtual relation for storing the query? |
| A. | function |
| B. | view |
| C. | procedure |
| D. | none of the mentioned |
| Answer» B. view | |
| 213. |
Materialised views make sure that |
| A. | view definition is kept stable |
| B. | view definition is kept up-to-date |
| C. | view definition is verified for error |
| D. | view is deleted after specified time |
| Answer» B. view definition is kept up-to-date | |
| 214. |
Updating the value of the view |
| A. | will affect the relation from which it is defined |
| B. | will not change the view definition |
| C. | will not affect the relation from which it is defined |
| D. | cannot determine |
| Answer» A. will affect the relation from which it is defined | |
| 215. |
Which of the following is used at the end of the view to reject the tuples which do not satisfy the condition in where clause? |
| A. | with |
| B. | check |
| C. | with check |
| D. | all of the mentioned |
| Answer» C. with check | |
| 216. |
A consists of a sequence of query and/or update statements. |
| A. | transaction |
| B. | commit |
| C. | rollback |
| D. | flashback |
| Answer» A. transaction | |
| 217. |
In order to undo the work of transaction after last commit which one should be used? |
| A. | view |
| B. | commit |
| C. | rollback |
| D. | flashback |
| Answer» C. rollback | |
| 218. |
In case of any shut down during transaction before commit which of the following statement is done automatically? |
| A. | view |
| B. | commit |
| C. | rollback |
| D. | flashback |
| Answer» C. rollback | |
| 219. |
In order to maintain the consistency during transactions, database provides |
| A. | commit |
| B. | atomic |
| C. | flashback |
| D. | retain |
| Answer» B. atomic | |
| 220. |
A transaction completes its execution is said to be |
| A. | committed |
| B. | aborted |
| C. | rolled back |
| D. | failed |
| Answer» A. committed | |
| 221. |
Which of the following is used to get back all the transactions back after rollback? |
| A. | commit |
| B. | rollback |
| C. | flashback |
| D. | redo |
| Answer» C. flashback | |
| 222. |
will undo all statements up to commit? |
| A. | transaction |
| B. | flashback |
| C. | rollback |
| D. | abort |
| Answer» C. rollback | |
| 223. |
Which of the following is not an integrity constraint? |
| A. | not null |
| B. | positive |
| C. | unique |
| D. | check ‘predicate’ |
| Answer» B. positive | |
| 224. |
Domain constraints, functional dependency and referential integrity are special forms of |
| A. | foreign key |
| B. | primary key |
| C. | assertion |
| D. | referential constraint |
| Answer» C. assertion | |
| 225. |
Which of the following is the right syntax for the assertion? |
| A. | create assertion ‘assertion-name’ check ‘predicate’; |
| B. | create assertion check ‘predicate’ ‘assertion-name’; |
| C. | create assertions ‘predicates’; |
| D. | all of the mentioned |
| Answer» A. create assertion ‘assertion-name’ check ‘predicate’; | |
| 226. |
Data integrity constraints are used to: |
| A. | control who is allowed access to the data |
| B. | ensure that duplicate records are not entered into the table |
| C. | improve the quality of data entered for a specific property (i.e., table column) |
| D. | prevent users from changing the values stored in the table |
| Answer» C. improve the quality of data entered for a specific property (i.e., table column) | |
| 227. |
Dates must be specified in the format |
| A. | mm/dd/yy |
| B. | yyyy/mm/dd |
| C. | dd/mm/yy |
| D. | yy/dd/mm |
| Answer» B. yyyy/mm/dd | |
| 228. |
A on an attribute of a relation is a data structure that allows the database system to find those tuples in the relation that have a specified value for that attribute efficiently, without scanning through all the tuples of the relation. |
| A. | index |
| B. | reference |
| C. | assertion |
| D. | timestamp |
| Answer» A. index | |
| 229. |
Which of the following is used to store movie and image files? |
| A. | clob |
| B. | blob |
| C. | binary |
| D. | image |
| Answer» B. blob | |
| 230. |
The user defined data type can be created using |
| A. | create datatype |
| B. | create data |
| C. | create definetype |
| D. | create type |
| Answer» D. create type | |
| 231. |
Values of one type can be converted to another domain using which of the following? |
| A. | cast |
| B. | drop type |
| C. | alter type |
| D. | convert |
| Answer» A. cast | |
| 232. |
Which of the following closely resembles Create view? |
| A. | create table . . .like |
| B. | create table . . . as |
| C. | with data |
| D. | create view as |
| Answer» B. create table . . . as | |
| 233. |
In contemporary databases, the top level of the hierarchy consists of each of which can contain |
| A. | catalogs, schemas |
| B. | schemas, catalogs |
| C. | environment, schemas |
| D. | schemas, environment |
| Answer» A. catalogs, schemas | |
| 234. |
The database administrator who authorizes all the new users, modifies the database and takes grants privilege is |
| A. | super user |
| B. | administrator |
| C. | operator of operating system |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 235. |
Which of the following is used to provide privilege to only a particular attribute? |
| A. | grant select on employee to amit |
| B. | grant update(budget) on department to raj |
| C. | grant update(budget,salary,rate) on department to raj |
| D. | grant delete to amit |
| Answer» B. grant update(budget) on department to raj | |
| 236. |
Which of the following is true regarding views? |
| A. | the user who creates a view cannot be given update authorization on a view without having update authorization on the relations used to define the view |
| B. | the user who creates a view cannot be given update authorization on a view without having update authorization on the relations used to define the view |
| C. | if a user creates a view on which no authorization can be granted, the system will allow the view creation request |
| D. | a user who creates a view receives all privileges on that view |
| Answer» C. if a user creates a view on which no authorization can be granted, the system will allow the view creation request | |
| 237. |
If we wish to grant a privilege and to allow the recipient to pass the privilege on to other users, we append the clause to the appropriate grant command. |
| A. | with grant |
| B. | grant user |
| C. | grant pass privelege |
| D. | with grant option |
| Answer» D. with grant option | |
| 238. |
Which of the following is used to avoid cascading of authorizations from the user? |
| A. | granted by current role |
| B. | revoke select on department from amit, satoshi restrict; |
| C. | revoke grant option for select on department from amit; |
| D. | revoke select on department from amit, satoshi cascade; |
| Answer» B. revoke select on department from amit, satoshi restrict; | |
| 239. |
The granting and revoking of roles by the user may cause some confusions when that user role is revoked. To overcome the above situation |
| A. | the privilege must be granted only by roles |
| B. | the privilege is granted by roles and users |
| C. | the user role cannot be removed once given |
| D. | by restricting the user access to the roles |
| Answer» A. the privilege must be granted only by roles | |
| 240. |
Which of the following is used to access the database server at the time of executing the program and get the data from the server accordingly? |
| A. | embedded sql |
| B. | dynamic sql |
| C. | sql declarations |
| D. | sql data analysis |
| Answer» B. dynamic sql | |
| 241. |
Which of the following header must be included in java program to establish database connectivity using JDBC ? |
| A. | import java.sql.*; |
| B. | import java.sql.odbc.jdbc.*; |
| C. | import java.jdbc.*; |
| D. | import java.sql.jdbc.*; |
| Answer» A. import java.sql.*; | |
| 242. |
Which of the following invokes functions in sql? |
| A. | prepared statements |
| B. | connection statement |
| C. | callable statements |
| D. | all of the mentioned |
| Answer» C. callable statements | |
| 243. |
Which of the following function is used to find the column count of the particular resultset? |
| A. | getmetadata() |
| B. | metadata() |
| C. | getcolumn() |
| D. | get count() |
| Answer» A. getmetadata() | |
| 244. |
Which of the following is used as the embedded SQL in COBOL? |
| A. | exec sql <embedded sql statement >; |
| B. | exec sql <embedded sql statement > end-exec |
| C. | exec sql <embedded sql statement > |
| D. | exec sql <embedded sql statement > end exec; |
| Answer» B. exec sql <embedded sql statement > end-exec | |
| 245. |
Which of the following is used to distinguish the variables in SQL from the host language variables? |
| A. | . |
| B. | – |
| C. | : |
| D. | , |
| Answer» B. – | |
| 246. |
Which of the following is used to access large objects from a database ? |
| A. | setblob() |
| B. | getblob() |
| C. | getclob() |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 247. |
A is a special kind of a store procedure that executes in response to certain action on the table like insertion, deletion or updation of data. |
| A. | procedures |
| B. | triggers |
| C. | functions |
| D. | none of the mentioned |
| Answer» B. triggers | |
| 248. |
Triggers are supported in |
| A. | delete |
| B. | update |
| C. | views |
| D. | all of the mentioned |
| Answer» C. views | |
| 249. |
What are the after triggers? |
| A. | triggers generated after a particular operation |
| B. | these triggers run after an insert, update or delete on a table |
| C. | these triggers run after an insert, views, update or delete on a table |
| D. | all of the mentioned |
| Answer» B. these triggers run after an insert, update or delete on a table | |
| 250. |
The variables in the triggers are declared using |
| A. | – |
| B. | @ |
| C. | / |
| D. | /@ |
| Answer» B. @ | |
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