LOOP statement

Applies to: check marked yes Databricks SQL check marked yes Databricks Runtime 16.3 and above

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 LOOP statement 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
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