Tag: databases

Questions Related to databases

Which two describe a stored procedure? (Choose two)
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  1. A stored procedure is typically written in SQL.

  2. A stored procedure is a named PL/SQL block that can accept parameters.

  3. A stored procedure is a type of PL/SQL subprogram that performs an action.

  4. A stored procedure has three parts: the specification, the body, and the exception handler part.

  5. The executable section of a stored procedure contains statements that assigns values, control execution, and return values to the calling environment.

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Correct Option: B,C

A CALL statement inside the trigger body enables you to call ______.
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  1. A package.

  2. A stored function.

  3. A stored procedure.

  4. Another database trigger.

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Correct Option: C

Which type of argument passes a value from a procedure to the calling environment?
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  1. VARCHAR2

  2. BOOLEAN

  3. OUT

  4. IN

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Correct Option: C

Examine this procedure: CREATE OR REPLACE PROCEDURE ADD_PLAYER (V_ID IN NUMBER, V_LAST_NAME VARCHAR2) IS BEGIN INSERT INTO PLAYER (ID,LAST_NAME) VALUES (V_ID, V_LAST_NAME); COMMIT; END; This procedure must invoke the APD_BAT_STAT procedure and pass a parameter. Which statement, when added to the above procedure will successfully invoke the UPD_BAT_STAT procedure?

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  1. EXECUTE UPD_BAT_STAT(V_ID);

  2. UPD_BAT_STAT(V_ID);

  3. RUN UPD_BAT_STAT(V_ID);

  4. START UPD_BAT_STAT(V_ID);

Show answer
Correct Option: B

AI Explanation

To successfully invoke the UPD_BAT_STAT procedure within the ADD_PLAYER procedure, the correct statement to add is:

B. UPD_BAT_STAT(V_ID);

Explanation: In PL/SQL, to invoke a procedure, you simply write the procedure name followed by the parameter values enclosed in parentheses. Therefore, the correct syntax to invoke the UPD_BAT_STAT procedure with the parameter V_ID is UPD_BAT_STAT(V_ID).

Option A (EXECUTE UPD_BAT_STAT(V_ID)) is incorrect because the EXECUTE keyword is not required when invoking a procedure.

Option C (RUN UPD_BAT_STAT(V_ID)) is incorrect because the RUN keyword is not used to invoke a procedure in PL/SQL.

Option D (START UPD_BAT_STAT(V_ID)) is incorrect because the START keyword is not used to invoke a procedure in PL/SQL.

Therefore, the correct answer is B. UPD_BAT_STAT(V_ID).

When creating a function in SQL *Plus, you receive this message: .Warning: Function created with compilation errors.. Which command can you issue to see the actual error message?

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  1. SHOW FUNCTION_ERROR

  2. SHOW USER_ERRORS

  3. SHOW ERRORS

  4. SHOW ALL_ERRORS

Show answer
Correct Option: C

AI Explanation

To see the actual error message when creating a function in SQL*Plus, you can issue the command:

C. SHOW ERRORS

This command will display the compilation errors, if any, associated with the function creation. It provides detailed information about the errors encountered during the compilation process, such as the line number and the specific error message.

Examine this code: CREATE OR REPLACE FUNCTION gen_email_name (p_first_name VARCHAR2, p_last_name VARCHAR2, p_id NUMBER) RETURN VARCHAR2 is v_email_name VARCHAR2(19); BEGIN v_email_home := SUBSTR(p_first_name, 1, 1) || SUBSTR(p_last_name, 1, 7) || [email protected] .; UPDATE employees SET email = v_email_name WHERE employee_id = p_id; RETURN v_email_name; END; You run this SELECT statement: SELECT first_name, last_name gen_email_name(first_name, last_name, 108) EMAIL FROM employees; What occurs?

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  1. Employee 108 has his email name updated based on the return result of the function.

  2. The statement fails because functions called from SQL expressions cannot perform DML.

  3. The statement fails because the functions does not contain code to end the transaction.

  4. The SQL statement executes successfully, because UPDATE and DELETE statements are ignoring in stored functions called from SQL expressions.

  5. The SQL statement executes successfully and control is passed to the calling environment.

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Correct Option: B

Given a function CALCTAX : CREATE OR REPLACE FUNCTION calc tax (sal NUMBER) RETURN NUMBER IS BEGIN RETURN (sal * 0.05); END; If you want to run the above function from the SQL *Plus prompt, which statement is true?
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  1. You need to execute the command CALCTAX(1000); .

  2. You need to execute the command EXECUTE FUNCTION calc tax; .

  3. You need to create a SQL *Plus environment variable X and issue the command :X := CALCTAX(1000); .

  4. You need to create a SQL *Plus environment variable X and issue the command EXECUTE :X := CALCTAX;

  5. You need to create a SQL *Plus environment variable X and issue the command EXECUTE :X := CALCTAX(1000);

Show answer
Correct Option: E
Explanation:

To run the given function from the SQL*Plus prompt, the user needs to know the correct syntax for invoking a function in Oracle SQL. The function CALCTAX takes in a single parameter, sal, and returns the result of sal * 0.05.

Option A is incorrect because it is missing the keyword SELECT to return the result of the function.

Option B is incorrect because the keyword FUNCTION is not used in the EXECUTE statement, and the argument sal is not provided.

Option C is incorrect because SQL*Plus environment variables are not required to execute a function, and it is missing the keyword SELECT to return the result of the function.

Option D is incorrect because it is missing the argument sal.

Option E is the correct answer because it first declares an SQL*Plus environment variable X, executes the function CALCTAX with the argument 1000, and assigns the result to the variable X. The keyword SELECT is not required because the result is assigned to a variable.

Therefore, the answer is: E. You need to create a SQL*Plus environment variable X and issue the command EXECUTE :X := CALCTAX(1000);

Which statement is valid when removing procedures?

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  1. Use a drop procedure statement to drop a standalone procedure.

  2. Use a drop procedure statement to drop a procedure that is part of a package. Then recompile the package specification.

  3. Use a drop procedure statement to drop a procedure that is part of a package. Then recompile the package body.

  4. For faster removal and re-creation, do not use a drop procedure statement. Instead, recompile the procedure using the alter procedure statement with the REUSE SETTINGS clause.

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Correct Option: A

Examine this code: CREATE OR REPLACE PRODECURE add_dept (p_dept_name VARCHAR2 DEFAULT 'placeholder', p_location VARCHAR2 DEFAULT 'Boston') IS BEGIN INSERT INTO departments VALUES (dept_id_seq.NEXTVAL, p_dept_name, p_location); END add_dept; / Which three are valid calls to the add_dep procedure ? (Choose three)
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  1. add_dept;

  2. add_dept( .Accounting .);

  3. add_dept(, .New York .);

  4. add_dept(p_location=> .New York .);

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Correct Option: A,B,D

Examine this function: CREATE OR REPLACE FUNCTION CALC_PLAYER_AVG (V_ID in PLAYER_BAT_STAT.PLAYER_ID%TYPE) RETURN NUMBER IS V_AVG NUMBER; BEGIN SELECT HITS / AT_BATS INTO V_AVG FROM PLAYER_BAT_STAT WHERE PLAYER_ID = V_ID; RETURN (V_AVG); END; Which statement will successfully invoke this function in SQL *Plus?
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  1. SELECT CALC_PLAYER_AVG(PLAYER_ID) FROM PLAYER_BAT_STAT;

  2. EXECUTE CALC_PLAYER_AVG (31);

  3. CALC_PLAYER (.RUTH.);

  4. CALC_PLAYER_AVG(31);

  5. START CALC_PLAYER_AVG(31)

Show answer
Correct Option: A