Do Until loop in SQL Server?


The WHILE statement defines a set of statements to be executed until a condition that is evaluated at the beginning of the WHILE loop is false. The while-loop-condition (an expression) is evaluated before each iteration of the loop.

How do you write a Do WHILE LOOP in SQL Server?

UNTIL version of SQL server.

  1. DO.. WHILE Loop. …
  2. REPEAT..UNTIL Loop. DECLARE @X INT = 1; WAY: — Here the REPEAT statement PRINT @X; SET @X += 1; IFNOT(@X > 10) GOTO WAY;
  3. FOR Loop. DECLARE @cnt INT = 0; WHILE @cnt < 10 BEGIN PRINT ‘Inside FOR LOOP’; SET @cnt = @cnt + 1; END; PRINT ‘Done FOR LOOP’;

How do you create a loop in SQL?

The Basic Syntax of a WHILE Loop

  1. –This variable keeps track of how many times the loop has run.
  2. DECLARE @Counter INT.
  3. SET @Counter = 0.
  4. –The loop begins by checking a condition is met.
  5. –Here we check that the counter has not exceeded 10.
  6. WHILE @Counter <= 10.
  7. –When the condition is met, the loop is entered.
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Do Until is a looping statement?

Once the expression is false, your program stops running. A “Do Until” loop statement runs until a logical statement is true. This means that as long as your expression is false, the program will run until it is true. Once the expression is true, the program stops running.

How do I stop a WHILE LOOP in SQL?

SQL Server BREAK statement overview

To exit the current iteration of a loop, you use the BREAK statement. In this syntax, the BREAK statement exit the WHILE loop immediately once the condition specified in the IF statement is met. All the statements between the BREAK and END keywords are skipped.

Which is better cursor or WHILE LOOP in SQL Server?

While SQL While loop is quicker than a cursor, reason found that cursor is defined by DECLARE CURSOR. Every emphasis of the loop will be executed inside system memory and consuming required server assets.

How do I run a SQL query in a for loop?

Running a Query Inside the Loop

  1. WHILE @Counter <= @MaxOscars.
  2. BEGIN.
  3. SET @NumFilms =
  5. FROM tblFilm.
  6. WHERE FilmOscarWins = @Counter.
  7. SET @Counter += 1.
  8. END.

How do I stop an infinite loop in SQL Server?

In SQL Server, the BREAK statement is used when you want to exit from a WHILE LOOP and execute the next statements after the loop’s END statement.

What is evaluated at the top of a WHILE LOOP in SQL?

The WHILE-LOOP statement associates a Boolean expression with a sequence of statements enclosed by the keywords LOOP and END LOOP . Before each iteration of the loop, the expression is evaluated. If the expression returns TRUE , the sequence of statements is executed, then control resumes at the top of the loop.

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What is a for loop in SQL?

A FOR LOOP is a repetition control structure that allows you to efficiently write a loop that needs to execute a specific number of times.

What are 3 types of loops in SQL?

Explain Different Types of Loops in PL/SQL

  • The simple or infinite loop.
  • The FOR loop.
  • The WHILE loop.

What is a nested loop give an example?

If a loop exists inside the body of another loop, it’s called a nested loop. Here’s an example of the nested for loop. // outer loop for (int i = 1; i <= 5; ++i) { // codes // inner loop for(int j = 1; j <=2; ++j) { // codes } .. } … And, inside the loop, we can create another loop to iterate 7 times (7 days).

Is used to end do loop?

You can use Exit Do to escape the loop. You can include any number of Exit Do statements anywhere in a Do… Loop . When used within nested Do loops, Exit Do transfers control out of the innermost loop and into the next higher level of nesting.

Which is true of do loop?

The do while loop checks the condition at the end of the loop. This means that the statements inside the loop body will be executed at least once even if the condition is never true. The do while loop is an exit controlled loop, where even if the test condition is false, the loop body will be executed at least once.

What is loop example?

A loop is used for executing a block of statements repeatedly until a particular condition is satisfied. For example, when you are displaying number from 1 to 100 you may want set the value of a variable to 1 and display it 100 times, increasing its value by 1 on each loop iteration.

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