How do you create a loop in SQL query?

How do you write a loop in SQL query?

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.

Is there a for loop in SQL?

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

How do you run a query in a for 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.

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.

How do you create a loop in MySQL?

Loops in MySQL

  1. Syntax : …
  2. Parameters – …
  3. Example-1 : DROP PROCEDURE IF EXISTS GeekLoop(); DELIMITER $$ CREATE PROCEDURE GeekLoop() BEGIN DECLARE no INT; SET no = 0; loop: LOOP SET no = no +1; select no ; IF no =5 THEN LEAVE loop; END IF; END LOOP loop; SELECT no; END $$ DELIMITER ; …
  4. Output – 0, 1, 2, 3, 4, 5.
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How do I create a foreach loop in SQL Server?

1. create a temp table and put the records you want to iterate in there 2. use WHILE @@ROWCOUNT <> 0 to do the iterating 3. to get one row at a time do, SELECT TOP 1 <fieldnames> b. save the unique ID for that row in a variable 4.

How do you run a while loop in SQL Server?

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 I number a row in SQL?

Row_Number function in SQL

In this blog, you will see Row_Number function without Partition By or with Partition By clause.

How do you loop through an array in SQL Server?

Solution

  1. Use DATABASENAME.
  2. GO.
  3. DECLARE @PRODUCTDETAILSTABLE table (PRODUCTNAME nvarchar(100), PRODUCTID int, PRODUCTCOST int)
  4. — Declare your array table variable.
  5. DECLARE @MYARRAY table (TEMPCOL nvarchar(50), ARRAYINDEX int identity(1,1) )

What is Do While loop in SQL with example?

A while loop will check the condition first and then executes the block of Sql Statements within it as along as the condition evaluates to true. Example: Basic while loop example. The below while loop executes the statements within it 4 times.

Do While loop in SQL procedure?

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.

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How do I create a cursor in SQL?

To work with cursors you must use the following SQL statements: DECLARE CURSOR. OPEN. FETCH.

Cursors in SQL procedures

  1. Declare a cursor that defines a result set.
  2. Open the cursor to establish the result set.
  3. Fetch the data into local variables as needed from the cursor, one row at a time.
  4. Close the cursor when done.

How many loops are there in SQL?

There are 4 types of PL/SQL Loops.

How do you create a cursor in SQL Server?

Cursor in SQL Server

  1. DECLARE statements – Declare variables used in the code block.
  2. SETSELECT statements – Initialize the variables to a specific value.
  3. DECLARE CURSOR statement – Populate the cursor with values that will be evaluated. …
  4. OPEN statement – Open the cursor to begin data processing.