Chapter-21: Loop (Simple / Basic , While & Repeat loop) in SQL with example | MySQL database

Published: 14 November 2023
on channel: All about data

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Loop (Simple / Basic , While & Repeat loop) in SQL with example | MySQL database

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A loop in SQL is a programming construct that allows you to execute a block of code multiple times. There are three main types of loops in SQL:
There are three main types of loops in SQL:

Simple loop
WHILE loop
REPEAT loop
Simple loop

A simple loop is a loop that executes a block of code multiple times, until a specific condition is met. The syntax for a simple loop is as follows:

SQL
LOOP
-- Code block to be executed
EXIT WHEN condition;
END LOOP;
Use code with caution. Learn more
The EXIT WHEN statement terminates the loop when the condition is met. If the condition is not met, the loop will continue to execute the code block.

WHILE loop
A WHILE loop is a loop that executes a block of code while a condition is true. The syntax for a WHILE loop is as follows:

SQL
WHILE condition
BEGIN
-- Code block to be executed
END;
Use code with caution. Learn more
The code block will be executed repeatedly, as long as the condition is true. When the condition becomes false, the loop will terminate.

REPEAT loop

A REPEAT loop is a loop that executes a block of code at least once, and then continues to execute the block of code as long as a condition is true. The syntax for a REPEAT loop is as follows:

SQL
REPEAT
-- Code block to be executed
UNTIL condition;
Use code with caution. Learn more
The code block will be executed at least once, even if the condition is false. The loop will then continue to execute the code block as long as the condition is true.

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