Is there a WHILE loop in SQL?

Is there 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 write a loop query in SQL?

Syntax

1. The initial step is executed first, and only once. This step allows you to declare and initialize any loop control variables.
2. Next, the condition, i.e., initial_value ..
3. After the body of the for loop executes, the value of the counter variable is increased or decreased.
4. The condition is now evaluated again.

Can we run SQL query in loop?

SQL WHILE loop provides us with the advantage to execute the SQL statement(s) repeatedly until the specified condition result turn out to be false. In the following sections of this article, we will use more flowcharts in order to explain the notions and examples.

How do you loop a stored procedure in SQL Server?

Foreach in SQL Server stored procedure

1. You need a unique column in the table over which the loop will iterate.
2. If you do not have such a column, you can simply add an Identity column to the table, then iterate over that column values.
3. We have a table Persons.
4. We will add an identity column to this table.

What is SQL Server loop?

In SQL Server, a loop is the technique where a set of SQL statements are executed repeatedly until a condition is met. SQL Server supports the WHILE loop. The execution of the statements can be controlled from within the WHLE block using BREAK and CONTINUE keywords.

How do you create a loop in SQL Server?

I am detailing answer on ways to achieve different types of loops in SQL server.

1. FOR Loop. DECLARE @cnt INT = 0; WHILE @cnt < 10 BEGIN PRINT ‘Inside FOR LOOP’; SET @cnt = @cnt + 1; END; PRINT ‘Done FOR LOOP’;
2. DO.. WHILE Loop.
3. REPEAT..UNTIL Loop.

How do I run a SQL script from a loop?

Running a Query Inside the Loop

1. WHILE @Counter <= @MaxOscars.
2. BEGIN.
3. SET @NumFilms =
4. SELECT COUNT(*)
5. FROM tblFilm.
6. WHERE FilmOscarWins = @Counter.
7. SET @Counter += 1.
8. END.

Which is better cursor or WHILE loop in SQL Server?

Always confusing thing is which one is better; SQL While loop or cursor? 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 many types of loops are there in SQL Server?

Almost all programming languages implement them, and we’ll usually meet these 3 types of loops: WHILE – While the loop condition is true, we’ll execute the code inside that loop. DO … WHILE – Works in the same manner as the WHILE loop, but the loop condition is tested at the end of the loop.

What is the alternative for while loop in SQL Server?

The Common Table Expressions started in SQL Server 2005 and they can be used to replace cursors or the while loop. It is also used for recursive queries and to reference the result table multiple times. As you can see, CTEs is an alternative in many situations to replace the WHILE loop.

Which is faster cursor or while loop SQL?

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.

Which is better for or while loop?

In general, you should use a for loop when you know how many times the loop should run. If you want the loop to break based on a condition other than the number of times it runs, you should use a while loop.

Are there any loops in SQL?

In SQL Server, there is no FOR LOOP. However, you simulate the FOR LOOP using the WHILE LOOP.

How to set variables in while loop in SQL Server?

Control how many rows are inserted by controlling how many times the loop is executed.

Supply the value inserted into the integer column.

Function as part of the expression that generates letters to be inserted into the character column.

How to organize infinite while loop in SQL Server?

Syntax. To view Transact-SQL syntax for SQL Server 2014 and earlier,see Previous versions documentation.

Arguments.

Remarks.

Examples.

Examples: Azure Synapse Analytics and Analytics Platform System (PDW) In the following example,if the average list price of a product is less than$300,the WHILE loop doubles the

See Also

How to avoid while loop in SQL?

Avoid the use of the WHILE LOOP

Use UNION ALL instead of UNION whenever is possible

Avoid using the joins of multiple tables in the where and join in the from clause.

How to use while exists in a loop?

If you inadvertently create an infinite loop (that is,a loop that never ends on its own),stop execution of the loop by pressing Ctrl+C.

If the conditional expression evaluates to a matrix,MATLAB evaluates the statements only if all elements in the matrix are true (nonzero).

To programmatically exit the loop,use a break statement.