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REPEAT statement

Applies to: check marked yes Databricks Runtime 16.3 and later

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Repeat the execution of a list of statements until a condition is true.

This statement may only be used within a compound statement.

Syntax​

[ label : ] REPEAT
  { stmt ; } [...]
  UNTIL cond
  END REPEAT [ label ]

Parameters​

  • label

    An optional label for the loop, which is unique amongst all labels for statements within which the REPEAT statement is contained. The label can be used to LEAVE or ITERATE the loop.

  • cond

    Any expression evaluating to a BOOLEAN

  • stmt

    A SQL statement

Examples​

SQL
-- sum up all odd numbers from 1 through 10
> BEGIN
    DECLARE sum INT DEFAULT 0;
    DECLARE num INT DEFAULT 0;
    sumNumbers: REPEAT
      SET num = num + 1;
      IF num % 2 = 0 THEN
        ITERATE sumNumbers;
      END IF;
      SET sum = sum + num;
    UNTIL num = 10
    END REPEAT 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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