Tag: databases

Questions Related to databases

With SQL, how can you return all the records from a table named "Persons" sorted descending by "FirstName"?
technology databases

  1. SELECT * FROM Persons ORDER FirstName DESC

  2. SELECT * FROM Persons SORT BY 'FirstName' DESC

  3. SELECT * FROM Persons ORDER BY FirstName DESC

  4. SELECT * FROM Persons SORT 'FirstName' DESC

Show answer
Correct Option: C

With SQL, how can you insert a new record into the "Persons" table?
technology databases

  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

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Correct Option: A

With SQL, how can you insert "Olsen" as the "LastName" in the "Persons" table?
technology databases

  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

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Correct Option: B

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

technology databases

  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'

Show answer
Correct Option: B

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

technology databases

  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'

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Correct Option: A

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

technology databases

  1. SELECT COUNT() FROM Persons

  2. SELECT COLUMNS() FROM Persons

  3. SELECT COLUMNS(*) FROM Persons

  4. SELECT COUNT(*) FROM Persons

Show answer
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?
technology databases

  1. Four

  2. Three

  3. Two

  4. Only one

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Correct Option: B

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

  1. True

  2. False

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Correct Option: A

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

  1. QUEST TOAD FOR ORACLE 9

  2. None

  3. SCOOTER SOFTWARE BEYOND COMPARE 3

  4. EMBARCADERO DB ARTISAN 8

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Correct Option: C

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

technology databases

  1. True

  2. False

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Correct Option: B