In SQL Server, there is no FOR LOOP. However, you simulate the FOR LOOP using the WHILE LOOP.
How do I run a for loop in SQL Server?
I am detailing answer on ways to achieve different types of loops in SQL server.
- FOR Loop. DECLARE @cnt INT = 0; WHILE @cnt < 10 BEGIN PRINT ‘Inside FOR LOOP’; SET @cnt = @cnt + 1; END; PRINT ‘Done FOR LOOP’;
- DO.. WHILE Loop. …
- REPEAT..UNTIL Loop.
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 select a loop in SQL query?
- Create function that parses incoming string (say “AABBCC”) as a table of strings (in particular “AA”, “BB”, “CC”).
- Select IDs from your table and use CROSS APPLY the function with data as argument so you’ll have as many rows as values contained in the current row’s data. No need of cursors or stored procs.
How do you loop a table in SQL Server?
SQL Server Cursor Example Converted to a While Loop
This key will be associated to a ProductID from the Products table. CREATE TABLE #TallyTable ( Iterator INT IDENTITY(1, 1), ProductID INT ); INSERT INTO #TallyTable ( ProductID ) SELECT ProductID FROM dbo.
How do you loop through a result set in SQL?
If the returning ResultSet Object of a query statement contains multiple rows, you can use res. next() method to loop through each row in the output.
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.
Can we write loops in SQL?
In programming, a loop allows you to write a set of code that will run repeatedly within the same program. Many programming languages have several different types of loop to choose from, but in SQL Server there is only one: the WHILE loop.
What is difference between stored procedure and trigger?
A stored procedure is a group of SQL statements that is compiled one time, and then can be executed many times. Triggers are named database objects that are implicitly fired when a triggering event occurs. The trigger action can be run before or after the triggering event.
How do you stop an infinite loop in PL SQL?
You use an EXIT statement to stop looping and prevent an infinite loop. You can place one or more EXIT statements anywhere inside a loop, but not outside a loop. There are two forms of EXIT statements: EXIT and EXIT-WHEN .
How do you break a while loop in SQL?
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.
Is SQL a database?
SQL is a language to operate databases; it includes database creation, deletion, fetching rows, modifying rows, etc. SQL is an ANSI (American National Standards Institute) standard language, but there are many different versions of the SQL language.
How do you subquery in SQL?
SQL – Sub Queries
- Subqueries must be enclosed within parentheses.
- A subquery can have only one column in the SELECT clause, unless multiple columns are in the main query for the subquery to compare its selected columns.
- An ORDER BY command cannot be used in a subquery, although the main query can use an ORDER BY.
Can we use for loop in MySQL?
The MySQL LOOP statement could be used to run a block of code or set of statements, again and again, depends on the condition. labelname : It is an optional label at the start and end.
What is while programming?
The “While” Loop
A “While” Loop is used to repeat a specific block of code an unknown number of times, until a condition is met.
What is @@ Fetch_status in SQL Server?
This function returns the status of the last cursor FETCH statement issued against any cursor currently opened by the connection.