Tag: databases

Questions Related to databases

Which one of the following is not an Explicit Cursor attributes
technology databases

  1. cursor_name%Found

  2. cursor_name%NOTFOUND

  3. cursor_name%OPEN

  4. cursor_name%ROWCOUNT

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Correct Option: C

Which one of the following is not an Implicit Cursor attributes
technology databases

  1. SQL%Found

  2. SQL%ISOPEN

  3. SQL%NOTFOUND

  4. SQL%ROWCOUNT

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Correct Option: B

Query to view installed Oracle version information ?
technology databases
    1. select banner from v$version;
    1. select version from v$instance;
    1. select version from v$version;

  4. Both 1 and 2

  5. Both 2 and 3

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Correct Option: D

Which is not a valid PL/SQL Exception ?
technology databases

  1. Too_many_rows

  2. No_Data_Found

  3. Divide_Error

  4. Zero_Error

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Correct Option: C

Which is not a valid PL/SQL Cursor Exceptions?
technology databases

  1. Cursor_Already_Open

  2. Cursor_Not_Closed

  3. Invalid_Cursor

  4. None of the Above

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Correct Option: B

Which one is not a valid pseudo-columns?
technology databases

  1. USER

  2. UID

  3. CURVAL

  4. All are valid

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Correct Option: D

What is correct regarding output of SIGN function?
technology databases

  1. >0 for positive value

  2. 0 for positive value

  3. 0 for negative value

  4. 1 for positive value

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Correct Option: D

The command used to open a CURSOR FOR loop is
technology databases

  1. open

  2. fetch

  3. parse

  4. None

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Correct Option: D

Which procedure can be used to create a customized error message?
technology databases

  1. RAISE_ERROR

  2. SQLERRM

  3. RAISE_APPLICATION_ERROR

  4. RAISE_SERVER_ERROR

Show answer
Correct Option: C
Explanation:

To solve this question, the user needs to have knowledge of error handling in SQL.

Now, let's go through each option and explain why it is right or wrong:

A. RAISE_ERROR: This option is not a valid procedure to create a custom error message in SQL. RAISE_ERROR is not a standard Oracle SQL function.

B. SQLERRM: This option is not a procedure to create a custom error message, but it is a function that returns the error message associated with the most recently raised error exception. It is not used to raise custom exceptions.

C. RAISE_APPLICATION_ERROR: This option is correct. RAISE_APPLICATION_ERROR is a procedure used to create a customized error message in Oracle SQL. It allows an application to raise an error with a user-defined error message and error number.

D. RAISE_SERVER_ERROR: This option is not a valid procedure to create a custom error message in SQL. RAISE_SERVER_ERROR is not a standard Oracle SQL function.

Therefore, the correct answer is: C. RAISE_APPLICATION_ERROR

What happens when rows are found using a FETCH statement ?
technology databases

  1. It causes the cursor to close

  2. It loads the current row values into variables

  3. It causes the cursor to open

  4. It creates the variables to load the values

Show answer
Correct Option: B
Explanation:

When rows are found using a FETCH statement in SQL, it loads the current row values into variables.

Option B is the correct answer. The FETCH statement is used to retrieve rows from a cursor, and each time it is executed, it fetches the next row from the cursor result set and assigns the values to the specified variables. This allows us to work with the data retrieved from the cursor.

Here is a breakdown of the other options:

A. It causes the cursor to close: This option is incorrect. The FETCH statement does not close the cursor; it only retrieves the rows. The cursor can be closed explicitly using the CLOSE statement.

C. It causes the cursor to open: This option is incorrect. The FETCH statement is used after the cursor has been declared and opened. It does not open the cursor itself.

D. It creates the variables to load the values: This option is incorrect. The variables to hold the row values need to be declared before the FETCH statement is executed. The FETCH statement does not create the variables, but rather assigns the retrieved values to the existing variables.

Therefore, the correct answer is B. It loads the current row values into variables.