Procedural Language SQL Overview

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Questions and Answers

What is the correct syntax for declaring a variable using %TYPE in PL/SQL?

  • Table-name.Column-name Variable-name%TYPE;
  • Variable-name Table-name.Column-name%TYPE; (correct)
  • Table-name.Column-name %TYPE Variable-name;
  • Variable-name %TYPE Table-name.Column-name;

In PL/SQL, which of the following statements can be executed inside a PL/SQL block?

  • DML statements only
  • SELECT statements only
  • DDL statements only
  • DML and transaction control statements (correct)

Which type of loop in PL/SQL requires a specific condition to exit before proceeding with further statements?

  • LOOP...EXIT Loop
  • LOOP...EXIT WHEN Loop (correct)
  • FOR Loop
  • WHILE...LOOP Loop

What will the output be after the execution of this block of code: 'LOOP I := 1; DBMS_OUTPUT.PUT_LINE(‘aI: ’ || I); I := I + 1; IF I > 5 THEN EXIT; END IF; DBMS_OUTPUT.PUT_LINE(‘bI: ’ || I); END LOOP;'?

<p>aI: 1 bI: 2 aI: 2 bI: 3 aI: 3 bI: 4 aI: 4 bI: 5 aI: 5 (A)</p> Signup and view all the answers

Which looping structure in PL/SQL iterates through a predefined set of values?

<p>FOR Loop (C)</p> Signup and view all the answers

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Study Notes

Procedural Language SQL

  • Use %TYPE to declare variables with the same data type as a specific column in a table.
  • Syntax: Variable-name Table-name.Column-name %TYPE;
  • Example: For a variable X with the type of STNO in the STUDENT table: X STUDENT.STNO%TYPE;

PL/SQL - SQL Integration

  • SQL statements can run within PL/SQL, specifically using DML commands like SELECT, INSERT, UPDATE, and DELETE.
  • Transaction control statements, such as COMMIT, ROLLBACK, and SAVEPOINT, can also be utilized.
  • Example of inserting new products:
    • Declare a variable P with the type of PRODUCT.PID: P PRODUCT.PID%TYPE;
    • Begin block inserts products into the database and commits the transaction after updates.

Looping Structures in PL/SQL

  • PL/SQL includes five types of looping structures for control flow:
    • LOOP...EXIT Loop
    • LOOP...EXIT WHEN Loop
    • WHILE...LOOP Loop
    • FOR Loop

LOOP...EXIT Loop

  • General format:
    • Begin with LOOP and include various statements.
    • Use an IF condition to determine when to exit the loop with EXIT.
    • End the loop with END LOOP;

Example of LOOP...EXIT Loop

  • Declared a variable I of type NUMBER(6).
  • Start with I initialized to 1.
  • Inside the loop, output the current value of I, increment it, and check if it exceeds 5 to exit.
  • Demonstrates the progression through iterations, showing the output for both aI and bI.

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Related Documents

lect(3) PLSQL(2).pptx

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