LOOP statement
Repeat the execution of a list of statements.
This statement may only be used within a compound statement.
Syntax
[ label : ] LOOP
{ stmt ; } [...]
END LOOP [ label ]
Parameters
-
label
An optional label for the loop, which is unique amongst all labels for statements within which the
LOOPstatement is contained. If an end label is specified, it must match the beginning label. The label can be used to LEAVE or ITERATE the loop. -
stmt
A SQL statement
Examples
-- sum up all odd numbers from 1 through 10
> BEGIN
DECLARE sum INT DEFAULT 0;
DECLARE num INT DEFAULT 0;
sumNumbers: LOOP
SET num = num + 1;
IF num > 10 THEN
LEAVE sumNumbers;
END IF;
IF num % 2 = 0 THEN
ITERATE sumNumbers;
END IF;
SET sum = sum + num;
END LOOP sumNumbers;
VALUES (sum);
END;
25
-- Compare with the much more efficient relational computation:
> SELECT sum(num) FROM range(1, 10) AS t(num) WHERE num % 2 = 1;
25