What is evaluated at the top of a while loop in PL SQL?

Before each iteration of the loop, the condition is evaluated. If it is TRUE , the sequence of statements is executed, then control resumes at the top of the loop. If it is FALSE or NULL , the loop is skipped and control passes to the next statement.

What is evaluated at the top of a while loop?

The DO WHILE statement evaluates the condition at the top of the loop; the DO UNTIL statement evaluates the condition at the bottom of the loop. Note: If the expression is false, the statements in a DO WHILE loop do not execute.

What is Do While loop procedure in PL SQL?

PL/SQL while loop is used when a set of statements has to be executed as long as a condition is true, the While loop is used. The condition is decided at the beginning of each iteration and continues until the condition becomes false. Syntax of while loop: WHILE <condition>

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What is while loop Oracle?

The WHILE LOOP statement runs one or more statements while a condition is TRUE . The WHILE LOOP statement ends when the condition becomes FALSE or NULL , when a statement inside the loop transfers control outside the loop, or when PL/SQL raises an exception.

How do you write a while loop in Oracle?

PL/SQL While Loop Syntax

WHILE <EXIT condition> LOOP <execution block starts> . . . <execution_block_ends> END LOOP; In the above syntax, keyword ‘WHILE’ marks beginning of the loop and ‘END LOOP’ marks the end of the loop. EXIT condition is evaluated each time before the execution part is starting executing.

What is evaluated at the top of the while loop Mcq?

Explanation: While loop evaluates the condition expression as Boolean, if it is true, it executes the statements and when it is false it will terminate. 7.

What is top tested loop?

It is a loop with the test at the bottom, rather than the more usual test at the top. The syntax is: … First, the statements are executed, then the condition is tested; if it is true , then the entire loop is executed again. The loop exits when the test is performed and gives a false result.

How do you break a while loop in PL SQL?

Note: You must follow these steps while using PL/SQL Exit Loop.

  1. Initialize a variable before the loop body.
  2. Increment the variable in the loop.
  3. You should use EXIT WHEN statement to exit from the Loop. Otherwise the EXIT statement without WHEN condition, the statements in the Loop is executed only once.
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How do you do a while loop in SQL?

SQL While loop syntax

The while loop in SQL begins with the WHILE keyword followed by the condition which returns a Boolean value i.e. True or False. The body of the while loop keeps executing unless the condition returns false. The body of a while loop in SQL starts with a BEGIN block and ends with an END block.

How do you continue a loop in PL SQL?

Let’s take an example of PL/SQL continue statement.

  1. DECLARE.
  2. x NUMBER := 0;
  3. BEGIN.
  4. LOOP — After CONTINUE statement, control resumes here.
  5. DBMS_OUTPUT.PUT_LINE (‘Inside loop: x = ‘ || TO_CHAR(x));
  6. x := x + 1;
  7. IF x < 3 THEN.
  8. CONTINUE;

What are the difference between for loop and while loop?

For loop vs While loop

The difference between for loop and while loop is that in for loop the number of iterations to be done is already known and is used to obtain a certain result whereas in while loop the command runs until a certain condition is reached and the statement is proved to be false.

What are the types of loops in PL SQL?

There are 4 types of PL/SQL Loops.

  • Basic Loop / Exit Loop.
  • While Loop.
  • For Loop.
  • Cursor For Loop.

How do you write a loop in PL SQL?

PL/SQL For Loop Example 2

  1. DECLARE.
  2. VAR1 NUMBER;
  3. BEGIN.
  4. VAR1:=10;
  5. FOR VAR2 IN 1..10.
  6. LOOP.
  7. DBMS_OUTPUT.PUT_LINE (VAR1*VAR2);
  8. END LOOP;

How can a PL SQL block be executed?

First, connect to the Oracle Database server using Oracle SQL Developer. Second, create a new SQL file named anonymous-block. sql resided in the C:plsql directory that will store the PL/SQL code. Third, enter the PL/SQL code and execute it by clicking the Execute button or pressing the Ctrl-Enter keyboard shortcut.

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What is PL SQL in Rdbms?

PL/SQL is a block of codes that used to write the entire program blocks/ procedure/ function, etc. It is declarative, that defines what needs to be done, rather than how things need to be done. PL/SQL is procedural that defines how the things needs to be done. Execute as a single statement.

What is built in subprogram in SQL?

Subprograms are named PL/SQL blocks that can be called with a set of parameters. PL/SQL has two types of subprograms, procedures and functions. Generally, you use a procedure to perform an action and a function to compute a value.

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