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databases Online Quiz - 13

Description: databases Online Quiz - 13
Number of Questions: 20
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Tags: databases
Attempted 0/20 Correct 0 Score 0
  1. INSERT INTO Persons VALUES ('Jimmy', 'Jackson')

  2. INSERT ('Jimmy', 'Jackson') INTO Persons

  3. INSERT VALUES ('Jimmy', 'Jackson') INTO Persons

  4. INSERT ('Jimmy', 'Jackson') INTO Persons


Correct Option: A
  1. INSERT ('Olsen') INTO Persons (LastName)

  2. INSERT INTO Persons (LastName) VALUES ('Olsen')

  3. INSERT INTO Persons ('Olsen') INTO LastName

  4. INSERT FROM Persons ('Olsen') INTO LastName


Correct Option: B

How can you change "Hansen" into "Nilsen" in the "LastName" column in the Persons table?

  1. UPDATE Persons SET LastName='Hansen' INTO LastName='Nilsen'

  2. UPDATE Persons SET LastName='Nilsen' WHERE LastName='Hansen'

  3. MODIFY Persons SET LastName='Hansen' INTO LastName='Nilsen

  4. MODIFY Persons SET LastName='Nilsen' WHERE LastName='Hansen'


Correct Option: B

With SQL, how can you delete the records where the "FirstName" is "Peter" in the Persons Table?

  1. DELETE FROM Persons WHERE FirstName = 'Peter'

  2. DELETE FirstName='Peter' FROM Persons

  3. DELETE ROW FirstName='Peter' FROM Persons

  4. DELETE FROM Persons WHERE FirstName <> 'Peter'


Correct Option: A

With SQL, how can you return the number of records in the "Persons" table?

  1. SELECT COUNT() FROM Persons

  2. SELECT COLUMNS() FROM Persons

  3. SELECT COLUMNS(*) FROM Persons

  4. SELECT COUNT(*) FROM Persons


Correct Option: D

AI Explanation

To return the number of records in the "Persons" table using SQL, you can use the COUNT(*) function.

Let's go through each option to understand why it is correct or incorrect:

Option A) SELECT COUNT() FROM Persons - This option is incorrect because the COUNT() function requires an argument. The argument specifies the column or expression to count. Without the argument, the function will produce an error.

Option B) SELECT COLUMNS() FROM Persons - This option is incorrect because there is no COLUMNS() function in SQL. To select all columns from a table, you can use the * wildcard.

Option C) SELECT COLUMNS(*) FROM Persons - This option is incorrect because there is no COLUMNS() function in SQL. To select all columns from a table, you can use the * wildcard.

Option D) SELECT COUNT() FROM Persons - This option is correct because it uses the COUNT() function to count all records in the "Persons" table. The COUNT(*) function returns the number of rows in the specified table.

The correct answer is D. This option is correct because it uses the appropriate COUNT(*) function to return the number of records in the "Persons" table.

In how many ways the Funnel Stage can operate?

  1. Four

  2. Three

  3. Two

  4. Only one


Correct Option: B

Select statement in Sybase can include columns not specified in the GROUP BY clause

  1. True

  2. False


Correct Option: A

This tool compares two files and produces a detailed report on the mismatches and successful matches. Used extensively in data validation.

  1. QUEST TOAD FOR ORACLE 9

  2. None

  3. SCOOTER SOFTWARE BEYOND COMPARE 3

  4. EMBARCADERO DB ARTISAN 8


Correct Option: C

In Sybase we can not compare a date column with a varchar value.

  1. True

  2. False


Correct Option: B

Choose the data type not supported by SQL Server

  1. varchar

  2. int

  3. text

  4. binary

  5. Image


Correct Option: C,E

Tool(s) used for Sybase to oracle migration is/are:

  1. SQL Developer

  2. SQLWays

  3. Both a and b

  4. Only a


Correct Option: C

Sybase exodus is migration of Sybase to which of the following databases

  1. MYSQL

  2. SQL Server

  3. DB2

  4. Oracle

  5. All of the above/ Any database suggested by client


Correct Option: B,D

What is a child stored procedure?

  1. A procedure that is very small

  2. A procedure being invoked by another procedure

  3. A procedure that is not used by application

  4. System stored procedures


Correct Option: B

Choose the datatypes not supported by Oracle

  1. timestamp

  2. varchar

  3. datetime

  4. number

  5. raw


Correct Option: C

In Sybase what returns the number of row affected by the preceding query

  1. @@trancount

  2. @@rowcount

  3. @@sqlstatus

  4. @@rescount


Correct Option: B

Magic tables in Sybase are

  1. inserted

  2. updated

  3. deleted

  4. created


Correct Option: A,C

Identify the background process which, is responsible for writing data from buffer cache to the datafiles to make changes permanent

  1. Checkpoint (CKPT)

  2. Database Writer (DBWR)

  3. Process Monitor (PMON)

  4. Log Writer (LGWR)


Correct Option: B

Identify the parts of System Global Area. Choose all that apply.

  1. Database Buffer Cache

  2. Shared Pool

  3. Data Dictionary

  4. Redolog Group

  5. Redolog Buffer


Correct Option: A,B,E

Identify the physical components of the database. Choose all that apply

  1. Database

  2. Controlfile

  3. Table

  4. Datafile

  5. Index

  6. Redolog Group


Correct Option: B,D,F

Identify the physical component of the database, which stores the information about the database layout

  1. Datafile

  2. Controlfile

  3. Redolog Group

  4. Archivelogs

  5. Password File


Correct Option: B
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