How do you write a while loop in SQL?
How do you write 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.
What is a while loop in SQL?
The SQL While Loop is used to repeat a block of statements for a given number of times until the given condition is False. SQL Server While loop starts with the condition, and if the condition result is True, then statements inside the BEGIN..END block will execute. Otherwise, it won’t execute.
Does SQL have while loop?
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 loop in SQL?
Syntax
- The initial step is executed first, and only once. This step allows you to declare and initialize any loop control variables.
- Next, the condition, i.e., initial_value ..
- After the body of the for loop executes, the value of the counter variable is increased or decreased.
- The condition is now evaluated again.
How do you end 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.
How do you write a for loop in MySQL?
Loops in MySQL
- Syntax :
- Parameters –
- 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 ;
- Output – 0, 1, 2, 3, 4, 5.
How do you run a loop in MySQL?
Do While loop in DBMS?
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.
How do you write a loop in MySQL query?
What are 3 types of loops in SQL?
Controlling Loop Iterations: LOOP and EXIT Statements. LOOP statements execute a sequence of statements multiple times. There are three forms of LOOP statements: LOOP , WHILE-LOOP , and FOR-LOOP . For a description of the syntax of the LOOP statement, see “LOOP Statements”.
How do you continue a WHILE LOOP in SQL Server?
You use the CONTINUE statement to restart a WHILE LOOP and execute the WHILE LOOP body again from the start.
How do I stop a WHILE LOOP in SQL Server?
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.
What type of loop is the while loop?
A do-while loop is a kind of loop, which is a kind of control statement. It is a loop with the test at the bottom, rather than the more usual test at the top.
Do WHILE loop syntax?
Contrast with the while loop, which tests the condition before the code within the block is executed, the do-while loop is an exit-condition loop. This means that the code must always be executed first and then the expression or test condition is evaluated. If it is true, the code executes the body of the loop again.
Do WHILE loop uses?
A for loop is used where you know at compile time how many times this loop will execute. A while loop is normally used in a scenario where you don’t know how many times a loop will actually execute at runtime. A do-while loop is used where your loop should execute at least one time.
How to loop in SQL query?
Looping statements are used to perform a certain task repetitively. There are many looping statements available in SQL such as while loop, looping using the simple loop and exit keywords and labels, etc. However, there is no presence of functionality to use for loop in SQL.
