Tag: databases

Questions Related to databases

Which attribute is not correct for an explicit cursor?
technology databases

  1. %ROWCOUNT

  2. %ISOPEN

  3. %NOTFOUND

  4. %COUNT

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Correct Option: D

What is the smallest PL/SQL Block?

technology databases

  1. Begin Dbms_output.put_line('Heello World'); exception when others then Dbms_output.put_line('error'); end; /

  2. Begin null; End;

  3. Declare a varchar2(100) := 'Hello World'; Begin Dbms_output.put_line(a); exception when others then Dbms_output.put_line('error'); end; /

  4. begin Dbms_output.put_line('Heello World'); end; /

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Correct Option: B

What is true about the simple loop statement? 1. Loop block has entry criteria 2. Loop block checks for exit criteria 3. We need to put an entry criteria manually 4. We need to put an exit criteria manually. 5. Loop without any exit criteria will be indefinite loop.
technology databases

  1. 1, 2 and 4 are true

  2. all statements are valid

  3. Only 4 an d 5 are true

  4. 1, 4 and 5 are true

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Correct Option: C

Syntax for case structure?
technology databases

  1. Case [ TRUE | selector_variable ]] When [criteria1 | expression1 ] then criteria1_statements; When [criteria1 | expression1 ] then Criteria2_statements; Else block statement; end;

  2. Case value case [criteria1 | expression1 ] then criteria1_statements; case [criteria1 | expression1 ] then Criteria2_statements; Else block statement; end case;

  3. Case [ TRUE | selector_variable ]] When [criteria1 | expression1 ] then criteria1_statements; When [criteria1 | expression1 ] then Criteria2_statements; Else block statement; end case;

  4. Case [ TRUE | selector_variable ]] Loop When [criteria1 | expression1 ] then criteria1_statements; When [criteria1 | expression1 ] then Criteria2_statements; Else block statement; end Loop;

Show answer
Correct Option: C

BEGIN . . . BEGIN IF X=1 THEN RAISE A: ELSEIF X=2 THEN RAISE B; ELSE RAISE C; EXCEPTION WHEN A THEN . . . END; EXCEPTION WHEN B THEN . . . END; Whar will happen to exception B

technology databases

  1. The exception B will be handled in inner block

  2. The exception B will be handled in outer block exception handler

  3. The exception will not be handled as there is no handler defined for B in inner block

  4. The exception section in inner block is executed and also Outer block exception section as we have defined there too

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Correct Option: B

Begin Dbms_output.put_line(‘Hello world’) End; What is the error in the above block?
technology databases

  1. There is no error in the statement

  2. Exception handler is missing

  3. DBMS_OUTPUT.PUT_LINE package must be declared

  4. semicolon is missing in the line "Dbms_output.put_line(‘Hello world’)"

Show answer
Correct Option: D

DECLARE sal_limit NUMBER ( 4 ) := 0 ; my_ename emp.ename%TYPE ; my_sal emp.sal%TYPE ; CURSOR my_cursor IS SELECT ename , sal FROM emp WHERE sal > sal_limit ; BEGIN sal_limit := 1200 ; OPEN my_cursor; fetch my_cursor INTO my_ename , my_sal ; LOOP FETCH my_cursor INTO my_ename , my_sal ; EXIT WHEN my_cursor%NOTFOUND ; -- nothing returned INSERT INTO new_table VALUES ( my_ename , my_sal ) ; END LOOP ; COMMIT ; END ;
technology databases

  1. For cursor fetching we have to use Cursor For loops

  2. There is no close statement for closing the cursor statement

  3. No errors in the block

  4. No exception handler found

Show answer
Correct Option: B

CREATE OR REPLACE FUNCTION dml_call_sql (p_sal NUMBER) RETURN NUMBER IS BEGIN INSERT INTO employees(employee_id, last_name, email, hire_date, job_id, salary) VALUES(1, 'employee 1', '[email protected]', SYSDATE, 'SA_MAN', 1000); RETURN (p_sal + 100); END; / Function created. UPDATE employees SET salary = dml_call_sql(2000) WHERE employee_id = 170; What is the error in the block

technology databases

  1. No errors in the block

  2. ORA-04091: table PLSQL.employees is mutating. Trigger/function may not see it. ORA-06512: at PL/SQL "DBMS_CALL_SQL"

  3. There is no exception handler in the function

  4. No rows updated exception will occur

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Correct Option: B

What does the REPLACE option indicate while used in creating functions?
technology databases

  1. If the function exists, it will be dropped and replaced with the new version created by the statement.

  2. If the function does not exist, it will create a new one.

  3. No action will be taken

  4. There is no such option available.

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Correct Option: A

How many type of cursors are available?
technology databases

  1. 1

  2. 2

  3. 3

  4. 4

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Correct Option: B